Examine source code of WonderSwitcher

{
  "manifest_version": 2,
  "name": "WonderSwitcher",
  "description": "Switch between HTTP proxies quickly and easily",
  "version": "5.5.1",
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "WonderSwitcher",
    "default_icon": "icons/48x48-inactive.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.wonderproxy.com/*"
      ],
      "js": [
        "content_scripts/wp-site.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/geo.js"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "match_about_blank": true
    }
  ],
  "options_ui": {
    "page": "options/options.html#account",
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage",
    "proxy",
    "webRequest",
    "webRequestBlocking"
  ],
  "web_accessible_resources": [
    "content_scripts/geo-setup.js",
    "content_scripts/geo-setoverrides.js",
    "content_scripts/geo-setoriginals.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{aa653efc-e435-4d15-8312-f64711dcaeb6}"
    }
  }
}