Examine source code of Boost YouTube

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "homepage_url": "https://github.com/rty65tt/firefox-addon-boostyoutube",
  "author": "rty65tt",
  "manifest_version": 2,
  "version": "1.7",
  "default_locale": "en",
  "short_name": "boostyoutube",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "css": [
        "css/inject.css"
      ],
      "js": [
        "inject.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "commands": {
    "OpenYouTubeTab": {
      "suggested_key": {
        "default": "Alt+Y",
        "mac": "Alt+Y"
      },
      "description": "Alt+Y Open YouTube Page."
    }
  },
  "page_action": {
    "show_matches": [
      "https://*.youtube.com/watch*",
      "https://www.youtube.com/embed/*",
      "https://i.ytimg.com/vi/*"
    ],
    "default_icon": {
      "19": "icons/icon.svg"
    },
    "default_title": "Open|Switch [maxres|sd|hq]default.jpg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "boostyoutube@rty65tt.org",
      "strict_min_version": "80.0"
    }
  }
}