Examine source code of 3G Proxy

{
  "manifest_version": 2,
  "name": "3G Proxy",
  "description": "3G Proxy's browser extension",
  "version": "2.0.3",
  "background": {
    "persistent": true,
    "scripts": [
      "./background.js"
    ]
  },
  "browser_action": {
    "default_icon": "./assets/images/3g_flags/1.logo_off.png",
    "default_popup": "index.html"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "webRequest",
    "webRequestBlocking",
    "proxy",
    "notifications",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{b41362ed-1ed4-4920-bfb5-2f5e0e95e6a0}"
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"
}