Examine source code of Meetup Purifier

{
  "manifest_version": 2,
  "name": "Meetup Purifier",
  "description": "Use Meetup.com without getting hassled by poor design. It removes the bad things, adds useful improvements and new functions.",
  "version": "1.4.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "meetuppurifier@codev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_page": "/options.html",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "https://meetpure.cohesive.dev/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://meetpure.cohesive.dev/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/codev.js"
      ]
    },
    {
      "matches": [
        "*://*.meetup.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/meetup.js"
      ]
    }
  ]
}