Examine source code of Proxy Toggle Switcher FF

{
  "manifest_version": 3,
  "name": "Proxy Toggle Switcher FF",
  "version": "2.1",
  "default_locale": "en",
  "description": "Minimalist Proxy Switcher for Firefox",
  "permissions": [
    "proxy",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon-off-16.png",
      "32": "icons/icon-off-32.png",
      "48": "icons/icon-off-48.png",
      "128": "icons/icon-off.png"
    },
    "default_title": "Proxy Switcher"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "proxy-switcher-app@unique-id",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-off-16.png",
    "32": "icons/icon-off-32.png",
    "48": "icons/icon-off-48.png",
    "128": "icons/icon-off.png"
  }
}