Examine source code of Ping Blocker

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.1.0",
  "author": "Armin Sebastian",
  "homepage_url": "https://github.com/dessant/ping-blocker",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bd6d796-c31a-40ff-8cb1-92459b6443d9}",
      "strict_min_version": "115.0"
    }
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "content_security_policy": "default-src 'self';",
  "icons": {
    "16": "src/assets/icons/app/icon-16.png",
    "19": "src/assets/icons/app/icon-19.png",
    "24": "src/assets/icons/app/icon-24.png",
    "32": "src/assets/icons/app/icon-32.png",
    "38": "src/assets/icons/app/icon-38.png",
    "48": "src/assets/icons/app/icon-48.png",
    "64": "src/assets/icons/app/icon-64.png",
    "96": "src/assets/icons/app/icon-96.png",
    "128": "src/assets/icons/app/icon-128.png"
  },
  "background": {
    "page": "src/background/index.html"
  }
}