Examine source code of Toster Extension

{
  "manifest_version": 2,
  "default_locale": "ru",
  "name": "__MSG_extension_name__",
  "short_name": "__MSG_extension_shortname__",
  "description": "__MSG_extension_description__",
  "version": "2.5.12",
  "icons": {
    "16": "images/toster_logo_16.png",
    "24": "images/toster_logo_24.png",
    "32": "images/toster_logo_32.png",
    "48": "images/toster_logo_48.png",
    "128": "images/toster_logo_128.png"
  },
  "permissions": [
    "https://qna.habr.com/*",
    "https://hsto.org/*",
    "tabs",
    "contextMenus",
    "alarms",
    "notifications"
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://qna.habr.com/*"
      ],
      "run_at": "document_end",
      "css": [
        "css/toster.css"
      ],
      "js": [
        "toster.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "sounds/*.mp3",
    "css/*.css",
    "toster.js",
    "options.html"
  ],
  "externally_connectable": {
    "matches": [
      "*://*.qna.habr.com/*"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "chrome_style": false,
    "page": "options.html"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/toster_logo_16.png",
      "24": "images/toster_logo_24.png",
      "32": "images/toster_logo_32.png",
      "48": "images/toster_logo_48.png",
      "128": "images/toster_logo_128.png"
    },
    "default_title": "Toster Extension"
  },
  "omnibox": {
    "keyword": "toster"
  }
}