Examine source code of Advanced Email Blocker

{
  "manifest_version": 2,
  "name": "Advanced Email Blocker",
  "version": "1.1",
  "description": "Advanced email blocking with wildcards and pattern matching support",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "downloads",
    "https://mail.google.com/*",
    "https://*.google.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "96": "icon96.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "email-blocker@bits-pilani.edu",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "96": "icon96.png"
  }
}