Examine source code of Toggle Proxy WebExt

{
  "manifest_version": 2,
  "name": "Toggle Proxy WebExt",
  "version": "0.3.4",
  "description": "Adds a toolbar button and hotkey (Alt+X) to toggle between two proxy settings.",
  "developer": {
    "name": "defkev"
  },
  "applications": {
    "gecko": {
      "id": "toggle-proxy-webext@defkev",
      "strict_min_version": "60.0"
    }
  },
  "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"
      }
    }
  }
}