Examine source code of SearchBlocker

{
  "manifest_version": 2,
  "name": "SearchBlocker",
  "version": "2.0",
  "description": "Blocks selected domains from Google search results",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "SearchBlocker",
    "default_popup": "popup/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search?*"
      ],
      "js": [
        "searchblock.js"
      ],
      "css": [
        "searchblock.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "search@blocker.com"
    }
  }
}