Examine source code of TabXProxy

{
  "manifest_version": 2,
  "name": "TabXProxy",
  "version": "1.0",
  "description": "Switch browser proxy based on tab",
  "icons": {
    "16": "icons/icon-noproxy.png",
    "32": "icons/icon-noproxy.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "proxy",
    "tabGroups",
    "<all_urls>"
  ],
  "incognito": "spanning",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tabxproxy@tabxproxy",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}