Examine source code of linkit

{
  "name": "__MSG_extension_name__",
  "version": "2.1.13",
  "manifest_version": 2,
  "description": "__MSG_extension_description__",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "omnibox": {
    "keyword": "d"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icon128-gray.png",
    "default_title": "__MSG_extension_browser_action_title__"
  },
  "default_locale": "en",
  "commands": {
    "add_note": {
      "suggested_key": {
        "default": "Ctrl+Alt+S",
        "mac": "MacCtrl+Command+S"
      },
      "description": "__MSG_extension_context_menu_add_note__"
    },
    "open_home": {
      "suggested_key": {
        "default": "Ctrl+Alt+X",
        "mac": "MacCtrl+Command+X"
      },
      "description": "__MSG_extension_context_menu_open_home__"
    },
    "share_link": {
      "suggested_key": {
        "default": "Ctrl+Alt+E",
        "mac": "MacCtrl+Command+E"
      },
      "description": "__MSG_extension_context_menu_share_link__"
    }
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "<all_urls>",
    "cookies",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "popup.html"
  ],
  "externally_connectable": {
    "matches": [
      "https://linkit.space/*",
      "https://www.linkit.space/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b78cdbfc-2b94-420f-9d96-a297fa959253}"
    }
  }
}