Examine source code of GG Plugin

{
  "manifest_version": 2,
  "name": "__MSG_app_name__",
  "short_name": "__MSG_app_name__",
  "description": "__MSG_app_description__",
  "version": "1.0.1resigned1",
  "applications": {
    "gecko": {
      "id": "gg-plugin@gg.pl",
      "strict_min_version": "56.0"
    }
  },
  "icons": {
    "16": "assets/icon_16.png",
    "64": "assets/icon_64.png",
    "128": "assets/icon_128.png"
  },
  "background": {
    "page": "src/background.html?app=main"
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/gg_16_status_1.png",
      "32": "assets/gg_32_status_1.png"
    },
    "default_title": "GG"
  },
  "permissions": [
    "tabs",
    "notifications",
    "storage",
    "contextMenus",
    "*://*.gg.pl/*",
    "*://*.gadu-gadu.pl/*",
    "https://www.google-analytics.com/"
  ],
  "default_locale": "pl",
  "web_accessible_resources": [
    "_locales/*",
    "static/libs/Environment/*"
  ]
}