Examine source code of Toggle Proxy Extension

{
  "manifest_version": 2,
  "name": "Toggle Proxy WebExt",
  "version": "0.0.1",
  "description": "Three-state proxy toggle. Cycle with toolbar button or Alt+X.",
  "developer": {
    "name": "fluidpanda"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "toggle-proxy-webext@fluidpanda",
      "strict_min_version": "91.1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "proxy",
    "storage"
  ],
  "browser_action": {
    "browser_style": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+X"
      }
    }
  }
}