Examine source code of BetterTTV

{
  "version": "7.7.20",
  "manifest_version": 2,
  "name": "__MSG_EXTENSION_NAME__",
  "description": "__MSG_EXTENSION_DESCRIPTION__",
  "author": "NightDev, LLC",
  "homepage_url": "https://betterttv.com",
  "icons": {
    "128": "icon.png"
  },
  "default_locale": "en",
  "permissions": [
    "scripting",
    "activeTab",
    "*://*.twitch.tv/*"
  ],
  "optional_permissions": [
    "*://*.youtube.com/*"
  ],
  "minimum_chrome_version": "89",
  "web_accessible_resources": [
    "betterttv.js",
    "betterttv.css"
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "run.js"
      ],
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "exclude_matches": [
        "*://*.twitch.tv/*.html",
        "*://*.twitch.tv/*.html?*",
        "*://*.twitch.tv/*.htm",
        "*://*.twitch.tv/*.htm?*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@betterttv.net",
      "strict_min_version": "109.0"
    },
    "safari": {
      "strict_min_version": "16"
    }
  }
}