Examine source code of Proxy manager and switcher

{
  "name": "Proxy manager and switcher",
  "description": "The addon is designed to manage IP addresses purchased on the Proxy-IPv4 service.",
  "version": "1.0.3",
  "manifest_version": 3,
  "action": {
    "default_popup": "index.html",
    "default_title": "Proxy Ipv4"
  },
  "permissions": [
    "webRequest",
    "webRequestAuthProvider",
    "proxy",
    "declarativeNetRequest",
    "declarativeNetRequestFeedback",
    "storage",
    "scripting",
    "webNavigation",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "assets/favicons/favicon-16x16-light.png",
    "48": "assets/favicons/favicon-48x48-light.png",
    "128": "assets/favicons/android-chrome-192x192-light.png",
    "256": "assets/favicons/android-chrome-512x512-light.png",
    "512": "assets/favicons/android-chrome-512x512-light.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "data/inject.js"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "build/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "proxyipv4.ru@gmail.com",
      "strict_min_version": "91.1.0"
    }
  }
}