Examine source code of Proxy Per Tab

{
  "manifest_version": 2,
  "name": "Tab Proxy Switcher",
  "version": "0.1.0",
  "description": "Choose direct connection, browser proxy, or a saved proxy preset for each Firefox tab.",
  "permissions": [
    "proxy",
    "storage",
    "menus",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-proxy-switcher@example.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}