Examine source code of Discord Token Connect

{
  "manifest_version": 2,
  "name": "Discord Token Connect",
  "version": "1.0",
  "description": "This extension will allow you to connect to your discord account via your token",
  "icons": {
    "300": "icons/discord.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "sketch/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/discord.png",
    "default_popup": "sketch/index.html",
    "default_title": "Discord Token Connect",
    "browser_style": true
  },
  "web_accessible_ressources": [
    "content.js"
  ],
  "permissions": [
    "*://developer.mozilla.org/*",
    "webRequest"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f78c0e7c-3f62-433a-9d99-2530efc6fd89}"
    }
  }
}