Examine source code of G-Switcher

{
  "manifest_version": 2,
  "name": "G-Switcher",
  "version": "1.1",
  "description": "Allows a user to easily switch between Google accounts",
  "browser_specific_settings": {
    "gecko": {
      "id": "G-Switcher@skyler.cc",
      "strict_min_version": "90.0"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "G-Switcher"
  },
  "background": {
    "scripts": [
      "action.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "swap.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}