Initial commit: Plex Auto Skip Chrome extension

2026-08-16 22:55:33 -07:00
commit 0f1f2a309e
14 changed files with 1522 additions and 0 deletions
@@ -0,0 +1,16 @@
+name: Test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - run: npm install
+      - run: npm test
@@ -0,0 +1,3 @@
+node_modules/
+.DS_Store
+*.zip
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Justin Oros
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,50 @@
+# Plex Auto Skip
+
+A small Chrome extension that automatically clicks "Skip Intro" and "Skip Credits" on Plex Web, so you don't have to reach for the mouse every time.
+
+## Features
+
+- Watches the Plex Web player and clicks "Skip Intro" / "Skip Credits" the instant either button appears.
+- Works on `app.plex.tv` by default, or point it at your own server address (local IP, custom domain, whatever you use).
+- Toggle Skip Intro and Skip Credits independently — both on by default.
+- Settings save instantly and apply live, no reload required for toggle changes.
+
+## Install
+
+1. Download or clone this repo.
+2. Open `chrome://extensions` in Chrome.
+3. Turn on **Developer mode** (top right toggle).
+4. Click **Load unpacked** and select this project's folder.
+5. Click the extension's icon in the toolbar to open its settings.
+
+## Settings
+
+- **Plex URL** — defaults to `app.plex.tv`. Choose "Custom URL" and enter your own server address (e.g. `192.168.1.50:32400/web` or a custom domain) if you watch there instead.
+- **Skip Intro** / **Skip Credits** — both on by default. Uncheck either one if you'd rather click it yourself sometimes.
+
+Changing the Plex URL takes effect on your next page load — refresh your Plex tab after saving a new one. Toggle changes apply immediately.
+
+## How it works
+
+The extension's content script runs on every page but only activates once the page's hostname matches your configured Plex URL. From there it uses a `MutationObserver` to watch the page for any `<button>` or `[role="button"]` element whose visible text contains "skip intro" or "skip credit" (case-insensitive, so it still matches if Plex appends a countdown like "Skip Intro 0:05"). When a match appears and is actually visible, it clicks it — with a short cooldown per element so a single button can't be double-clicked in one burst, but can still be clicked again later if Plex reuses the same button for the next episode.
+
+Settings (your Plex URL and the two toggles) are stored with `chrome.storage.sync`, so they follow you across machines if you're signed into Chrome.
+
+## Testing
+
+This project has an automated test suite that simulates the Plex Web DOM with [jsdom](https://github.com/jsdom/jsdom) and exercises the real extension code — no browser or live Plex server required.
+
+```
+npm install
+npm test
+```
+
+The suite covers: clicking Skip Intro/Skip Credits, ignoring non-Plex pages, respecting the on/off toggles, matching a custom server URL, reacting to buttons added dynamically after page load, ignoring unrelated buttons, handling countdown suffixes in the button text, not clicking hidden buttons, correctly re-clicking a reused button after its cooldown, and the settings popup's save/validation/load behavior.
+
+## Troubleshooting
+
+If skipping stops working after a Plex Web update, it's most likely because Plex changed the button markup. Open DevTools on the player page, inspect the Skip Intro/Skip Credits button, and check whether it's still a `<button>` or `[role="button"]` element with "Skip Intro"/"Skip Credits" somewhere in its visible text. Open an issue (or a PR) with what you find.
+
+## License
+
+MIT — see [LICENSE](LICENSE).
@@ -0,0 +1,61 @@
+(function () {
+  let settings = DEFAULT_SETTINGS;
+  const recentClicks = new WeakMap();
+  const CLICK_COOLDOWN_MS = 1500;
+
+  function isSkipIntroButton(text) {
+    return text.indexOf("skip intro") !== -1;
+  }
+
+  function isSkipCreditsButton(text) {
+    return text.indexOf("skip credit") !== -1;
+  }
+
+  function isVisible(el) {
+    const style = window.getComputedStyle(el);
+    return style.display !== "none" && style.visibility !== "hidden" && style.opacity !== "0";
+  }
+
+  function canClick(el) {
+    const last = recentClicks.get(el);
+    if (last && Date.now() - last < CLICK_COOLDOWN_MS) return false;
+    recentClicks.set(el, Date.now());
+    return true;
+  }
+
+  function scanAndClick() {
+    if (!settings.skipIntro && !settings.skipCredits) return;
+    if (!hostMatchesConfig(window.location.hostname, settings.plexUrl)) return;
+
+    const nodes = document.querySelectorAll('button, [role="button"]');
+    nodes.forEach((el) => {
+      const text = (el.innerText || el.textContent || "").trim().toLowerCase();
+      if (!text) return;
+      if (!isVisible(el)) return;
+
+      const wantsIntroSkip = settings.skipIntro && isSkipIntroButton(text);
+      const wantsCreditsSkip = settings.skipCredits && isSkipCreditsButton(text);
+      if (!wantsIntroSkip && !wantsCreditsSkip) return;
+
+      if (canClick(el)) el.click();
+    });
+  }
+
+  function start() {
+    const observer = new MutationObserver(scanAndClick);
+    observer.observe(document.documentElement, { childList: true, subtree: true });
+    scanAndClick();
+  }
+
+  chrome.storage.sync.get(DEFAULT_SETTINGS, (loaded) => {
+    settings = loaded;
+    start();
+  });
+
+  chrome.storage.onChanged.addListener((changes, area) => {
+    if (area !== "sync") return;
+    Object.keys(changes).forEach((key) => {
+      settings[key] = changes[key].newValue;
+    });
+  });
+})();
@@ -0,0 +1,18 @@
+{
+  "manifest_version": 3,
+  "name": "Plex Auto Skip",
+  "version": "1.0.0",
+  "description": "Automatically clicks Skip Intro and Skip Credits buttons on Plex Web.",
+  "permissions": ["storage"],
+  "host_permissions": ["<all_urls>"],
+  "action": {
+    "default_popup": "popup.html"
+  },
+  "content_scripts": [
+    {
+      "matches": ["<all_urls>"],
+      "js": ["utils.js", "content.js"],
+      "run_at": "document_idle"
+    }
+  ]
+}
@@ -0,0 +1,846 @@
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+      "integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^5.1.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
+      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}
@@ -0,0 +1,12 @@
+{
+  "name": "plex-auto-skip",
+  "version": "1.0.0",
+  "description": "Chrome extension that automatically clicks Skip Intro and Skip Credits on Plex Web.",
+  "private": true,
+  "scripts": {
+    "test": "node --test tests/*.test.js"
+  },
+  "devDependencies": {
+    "jsdom": "^24.1.0"
+  }
+}
@@ -0,0 +1,99 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+  body {
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+    width: 280px;
+    padding: 16px;
+    color: #1a1a1a;
+  }
+  h1 {
+    font-size: 15px;
+    margin: 0 0 12px;
+  }
+  label {
+    display: block;
+    font-size: 12px;
+    font-weight: 600;
+    margin-bottom: 4px;
+    color: #555;
+  }
+  select, input[type="text"] {
+    width: 100%;
+    padding: 6px 8px;
+    font-size: 13px;
+    border: 1px solid #ccc;
+    border-radius: 6px;
+    margin-bottom: 10px;
+    box-sizing: border-box;
+  }
+  #customUrlRow {
+    display: none;
+  }
+  .toggle-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 8px 0;
+    border-top: 1px solid #eee;
+  }
+  .toggle-row:first-of-type {
+    border-top: none;
+  }
+  .toggle-row span {
+    font-size: 13px;
+  }
+  button.save {
+    width: 100%;
+    margin-top: 14px;
+    padding: 8px;
+    background: #e5a00d;
+    border: none;
+    border-radius: 6px;
+    color: #1a1a1a;
+    font-weight: 600;
+    font-size: 13px;
+    cursor: pointer;
+  }
+  button.save:hover {
+    background: #cc8f0b;
+  }
+  #status {
+    font-size: 11px;
+    color: #2a8f2a;
+    text-align: center;
+    margin-top: 8px;
+    height: 14px;
+  }
+</style>
+</head>
+<body>
+  <h1>Plex Auto Skip</h1>
+
+  <label for="urlPreset">Plex URL</label>
+  <select id="urlPreset">
+    <option value="default">app.plex.tv (default)</option>
+    <option value="custom">Custom URL</option>
+  </select>
+  <div id="customUrlRow">
+    <input type="text" id="customUrl" placeholder="e.g. 192.168.1.50:32400/web">
+  </div>
+
+  <div class="toggle-row">
+    <span>Skip Intro</span>
+    <input type="checkbox" id="skipIntro">
+  </div>
+  <div class="toggle-row">
+    <span>Skip Credits</span>
+    <input type="checkbox" id="skipCredits">
+  </div>
+
+  <button class="save" id="saveBtn">Save</button>
+  <div id="status"></div>
+
+  <script src="utils.js"></script>
+  <script src="popup.js"></script>
+</body>
+</html>
@@ -0,0 +1,64 @@
+document.addEventListener("DOMContentLoaded", () => {
+  const urlPreset = document.getElementById("urlPreset");
+  const customUrlRow = document.getElementById("customUrlRow");
+  const customUrl = document.getElementById("customUrl");
+  const skipIntro = document.getElementById("skipIntro");
+  const skipCredits = document.getElementById("skipCredits");
+  const saveBtn = document.getElementById("saveBtn");
+  const status = document.getElementById("status");
+
+  function toggleCustomRow() {
+    customUrlRow.style.display = urlPreset.value === "custom" ? "block" : "none";
+  }
+
+  urlPreset.addEventListener("change", toggleCustomRow);
+
+  chrome.storage.sync.get(DEFAULT_SETTINGS, (settings) => {
+    if (settings.plexUrl === DEFAULT_SETTINGS.plexUrl) {
+      urlPreset.value = "default";
+    } else {
+      urlPreset.value = "custom";
+      customUrl.value = settings.plexUrl.replace(/^https?:\/\//, "");
+    }
+    skipIntro.checked = settings.skipIntro;
+    skipCredits.checked = settings.skipCredits;
+    toggleCustomRow();
+  });
+
+  function showStatus(message, isError) {
+    status.textContent = message;
+    status.style.color = isError ? "#c0392b" : "#2a8f2a";
+    setTimeout(() => {
+      status.textContent = "";
+    }, 1500);
+  }
+
+  saveBtn.addEventListener("click", () => {
+    const isCustom = urlPreset.value === "custom";
+    let plexUrl = DEFAULT_SETTINGS.plexUrl;
+
+    if (isCustom) {
+      const trimmed = customUrl.value.trim();
+      if (!trimmed) {
+        showStatus("Enter a URL first", true);
+        return;
+      }
+      plexUrl = normalizePlexUrl(trimmed);
+      if (!getHostFromUrl(plexUrl)) {
+        showStatus("That URL doesn't look valid", true);
+        return;
+      }
+    }
+
+    chrome.storage.sync.set(
+      {
+        plexUrl: plexUrl,
+        skipIntro: skipIntro.checked,
+        skipCredits: skipCredits.checked
+      },
+      () => {
+        showStatus("Saved", false);
+      }
+    );
+  });
+});
@@ -0,0 +1,123 @@
+const test = require("node:test");
+const assert = require("node:assert");
+const { loadContentScript, wait } = require("./helpers");
+
+test("clicks a Skip Intro button on app.plex.tv", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Skip Intro</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1);
+});
+
+test("clicks a Skip Credits button on app.plex.tv", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Skip Credits</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1);
+});
+
+test("does nothing on a non-matching host", async () => {
+  const { window } = loadContentScript({
+    url: "https://example.com/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Skip Intro</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 0);
+});
+
+test("respects skipIntro:false toggle", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Skip Intro</button></body></html>`,
+    settings: { skipIntro: false, skipCredits: true }
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 0);
+});
+
+test("matches a custom configured URL by hostname", async () => {
+  const { window } = loadContentScript({
+    url: "http://192.168.1.50:32400/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Skip Intro</button></body></html>`,
+    settings: { plexUrl: "http://192.168.1.50:32400/web" }
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1);
+});
+
+test("clicks a button added dynamically after page load", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body></body></html>`
+  });
+
+  await wait(20);
+
+  const btn = window.document.createElement("button");
+  btn.textContent = "Skip Intro";
+  window.document.body.appendChild(btn);
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1);
+});
+
+test("does not click an unrelated button", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button>Watch Now</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 0);
+});
+
+test("real Plex markup: skip button includes a countdown suffix", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button><span>Skip Intro</span><span> 0:05</span></button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1);
+});
+
+test("same DOM node reused for a later segment still gets clicked after cooldown", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button id="skip">Skip Intro</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 1, "first segment's skip button should be clicked");
+
+  const btn = window.document.getElementById("skip");
+  btn.textContent = "";
+  await wait(1700);
+
+  btn.textContent = "Skip Intro";
+  await wait(50);
+  assert.strictEqual(
+    window.__clickedElements.length,
+    2,
+    "the same reused button should be clickable again after the cooldown"
+  );
+});
+
+test("does not click a hidden skip button", async () => {
+  const { window } = loadContentScript({
+    url: "https://app.plex.tv/web/index.html",
+    html: `<!DOCTYPE html><html><body><button style="display:none">Skip Intro</button></body></html>`
+  });
+
+  await wait(50);
+  assert.strictEqual(window.__clickedElements.length, 0);
+});
@@ -0,0 +1,89 @@
+const fs = require("fs");
+const path = require("path");
+const { JSDOM } = require("jsdom");
+
+function loadContentScript({ url, html, settings }) {
+  const dom = new JSDOM(html || "<!DOCTYPE html><html><body></body></html>", {
+    url: url,
+    runScripts: "dangerously"
+  });
+
+  const window = dom.window;
+  const storedSettings = Object.assign(
+    { plexUrl: "https://app.plex.tv", skipIntro: true, skipCredits: true },
+    settings || {}
+  );
+  const changeListeners = [];
+
+  window.__clickedElements = [];
+  const originalClick = window.HTMLElement.prototype.click;
+  window.HTMLElement.prototype.click = function () {
+    window.__clickedElements.push(this);
+    return originalClick.call(this);
+  };
+
+  window.chrome = {
+    storage: {
+      sync: {
+        get: (defaults, cb) => cb(Object.assign({}, defaults, storedSettings)),
+        set: (obj, cb) => {
+          Object.assign(storedSettings, obj);
+          if (cb) cb();
+        }
+      },
+      onChanged: {
+        addListener: (fn) => changeListeners.push(fn)
+      }
+    }
+  };
+
+  const utilsCode = fs.readFileSync(path.join(__dirname, "..", "utils.js"), "utf8");
+  const contentCode = fs.readFileSync(path.join(__dirname, "..", "content.js"), "utf8");
+  window.eval(utilsCode + "\n" + contentCode);
+
+  function fireStorageChange(changes) {
+    const wrapped = {};
+    Object.keys(changes).forEach((k) => {
+      wrapped[k] = { newValue: changes[k] };
+    });
+    changeListeners.forEach((fn) => fn(wrapped, "sync"));
+  }
+
+  return { dom, window, fireStorageChange };
+}
+
+function loadPopupScript({ initialSettings } = {}) {
+  const html = fs.readFileSync(path.join(__dirname, "..", "popup.html"), "utf8");
+  const dom = new JSDOM(html, { url: "chrome-extension://fake/popup.html", runScripts: "dangerously" });
+  const window = dom.window;
+  const storedSettings = Object.assign(
+    { plexUrl: "https://app.plex.tv", skipIntro: true, skipCredits: true },
+    initialSettings || {}
+  );
+  const savedCalls = [];
+
+  window.chrome = {
+    storage: {
+      sync: {
+        get: (defaults, cb) => cb(Object.assign({}, defaults, storedSettings)),
+        set: (obj, cb) => {
+          savedCalls.push(obj);
+          Object.assign(storedSettings, obj);
+          if (cb) cb();
+        }
+      }
+    }
+  };
+
+  const utilsCode = fs.readFileSync(path.join(__dirname, "..", "utils.js"), "utf8");
+  const popupCode = fs.readFileSync(path.join(__dirname, "..", "popup.js"), "utf8");
+  window.eval(utilsCode + "\n" + popupCode);
+
+  return { dom, window, savedCalls, storedSettings };
+}
+
+function wait(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+module.exports = { loadContentScript, loadPopupScript, wait };
@@ -0,0 +1,94 @@
+const test = require("node:test");
+const assert = require("node:assert");
+const { loadPopupScript, wait } = require("./helpers");
+
+test("defaults to app.plex.tv preset with both toggles on", async () => {
+  const { window } = loadPopupScript();
+  await wait(20);
+
+  assert.strictEqual(window.document.getElementById("urlPreset").value, "default");
+  assert.strictEqual(window.document.getElementById("skipIntro").checked, true);
+  assert.strictEqual(window.document.getElementById("skipCredits").checked, true);
+  assert.strictEqual(window.document.getElementById("customUrlRow").style.display, "none");
+});
+
+test("shows custom URL field pre-filled when a custom URL is already saved", async () => {
+  const { window } = loadPopupScript({
+    initialSettings: { plexUrl: "http://192.168.1.50:32400/web" }
+  });
+  await wait(20);
+
+  assert.strictEqual(window.document.getElementById("urlPreset").value, "custom");
+  assert.strictEqual(window.document.getElementById("customUrl").value, "192.168.1.50:32400/web");
+});
+
+test("saving the default preset persists the default Plex URL", async () => {
+  const { window, savedCalls } = loadPopupScript();
+  await wait(20);
+
+  window.document.getElementById("saveBtn").click();
+  await wait(20);
+
+  assert.strictEqual(savedCalls.length, 1);
+  assert.strictEqual(savedCalls[0].plexUrl, "https://app.plex.tv");
+});
+
+test("saving a custom URL normalizes and persists it", async () => {
+  const { window, savedCalls } = loadPopupScript();
+  await wait(20);
+
+  const urlPreset = window.document.getElementById("urlPreset");
+  urlPreset.value = "custom";
+  urlPreset.dispatchEvent(new window.Event("change"));
+  window.document.getElementById("customUrl").value = "192.168.1.50:32400/web";
+
+  window.document.getElementById("saveBtn").click();
+  await wait(20);
+
+  assert.strictEqual(savedCalls.length, 1);
+  assert.strictEqual(savedCalls[0].plexUrl, "http://192.168.1.50:32400/web");
+});
+
+test("saving Custom URL with a blank field does not silently fall back to the default", async () => {
+  const { window, savedCalls } = loadPopupScript();
+  await wait(20);
+
+  const urlPreset = window.document.getElementById("urlPreset");
+  urlPreset.value = "custom";
+  urlPreset.dispatchEvent(new window.Event("change"));
+  window.document.getElementById("customUrl").value = "   ";
+
+  window.document.getElementById("saveBtn").click();
+  await wait(20);
+
+  assert.strictEqual(savedCalls.length, 0, "should not save when the custom URL field is blank");
+  assert.match(window.document.getElementById("status").textContent, /enter|url/i);
+});
+
+test("saving an unparseable custom URL is rejected with an error, not saved", async () => {
+  const { window, savedCalls } = loadPopupScript();
+  await wait(20);
+
+  const urlPreset = window.document.getElementById("urlPreset");
+  urlPreset.value = "custom";
+  urlPreset.dispatchEvent(new window.Event("change"));
+  window.document.getElementById("customUrl").value = "http://";
+
+  window.document.getElementById("saveBtn").click();
+  await wait(20);
+
+  assert.strictEqual(savedCalls.length, 0, "should not save an invalid URL");
+});
+
+test("unchecking a toggle and saving persists it as false", async () => {
+  const { window, savedCalls } = loadPopupScript();
+  await wait(20);
+
+  window.document.getElementById("skipCredits").checked = false;
+  window.document.getElementById("saveBtn").click();
+  await wait(20);
+
+  assert.strictEqual(savedCalls.length, 1);
+  assert.strictEqual(savedCalls[0].skipCredits, false);
+  assert.strictEqual(savedCalls[0].skipIntro, true);
+});
@@ -0,0 +1,26 @@
+const DEFAULT_SETTINGS = {
+  plexUrl: "https://app.plex.tv",
+  skipIntro: true,
+  skipCredits: true
+};
+
+function normalizePlexUrl(input) {
+  let value = (input || "").trim();
+  if (!value) return DEFAULT_SETTINGS.plexUrl;
+  if (!/^https?:\/\//i.test(value)) value = "http://" + value;
+  return value;
+}
+
+function getHostFromUrl(urlString) {
+  try {
+    return new URL(urlString).hostname;
+  } catch (e) {
+    return null;
+  }
+}
+
+function hostMatchesConfig(currentHostname, configuredUrl) {
+  const configuredHost = getHostFromUrl(configuredUrl);
+  if (!configuredHost) return false;
+  return currentHostname === configuredHost;
+}