Examine source code of VideoDetector

{
  "manifest_version": 2,
  "name": "VideoDetector",
  "author": "einKnie@gmx.at",
  "version": "1.5",
  "description": "Detects if a video is played in a tab and prepends the tab's title with a custom string.",
  "applications": {
    "gecko": {
      "id": "einKnie@gmx.at"
    }
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "videoDetector",
    "browser_style": true,
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "background": {
    "scripts": [
      "vd_background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.vimeo.com/*",
        "*://*.netflix.com/*",
        "*://*.orf.at/*",
        "*://*.twitch.tv/*"
      ],
      "js": [
        "vd_content.js"
      ]
    }
  ]
}