Examine source code of Google Cleaner

{
  "manifest_version": 2,
  "name": "Google Cleaner",
  "version": "4.0",
  "description": "Old style search results for easier title scanning and faster access to common search filters.",
  "homepage_url": "https://github.com/icetbr/webext-google-cleaner",
  "author": "icetbr",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "google-cleaner2@icetbr",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "addonIds": [
      "google-cleaner",
      "google-cleaner/eipbokcgljcghpakakmjinohkloboifg"
    ],
    "keywords": [
      "userscript",
      "google search",
      "minimalist"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "include_globs": [
        "https://www.google.*/search*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}