Examine source code of Dark Mode Ultimate

{
  "version": "1.0.2resigned1",
  "name": "Dark Mode Ultimate",
  "short_name": "__MSG_short_name__",
  "manifest_version": 2,
  "description": "__MSG_description__",
  "default_locale": "en",
  "background": {
    "page": "lib/chrome/background.html"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "contextMenus",
    "tabs"
  ],
  "web_accessible_resources": [
    "data/content_script/*.css"
  ],
  "options_ui": {
    "chrome_style": true,
    "page": "data/options/options.html"
  },
  "browser_action": {
    "default_title": "Dark Mode",
    "default_icon": {
      "16": "data/icons/on/16.png",
      "32": "data/icons/on/32.png",
      "48": "data/icons/on/48.png",
      "64": "data/icons/on/64.png"
    }
  },
  "content_scripts": [
    {
      "all_frames": false,
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "exclude_globs": [
        "*/chrome/newtab*"
      ],
      "js": [
        "data/content_script/inject.js"
      ]
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lib/chrome/dark.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "icons": {
    "16": "data/icons/on/16.png",
    "32": "data/icons/on/32.png",
    "48": "data/icons/on/48.png",
    "64": "data/icons/on/64.png",
    "128": "data/icons/on/128.png"
  },
  "applications": {
    "gecko": {
      "id": "dark-mode@addons.cool"
    }
  }
}