Examine source code of ThinkKeep

{
  "manifest_version": 3,
  "name": "ThinkKeep",
  "description": "Enhances LinkedIn by showing a custom tooltip when hovering over profile avatars in the news feed.",
  "version": "1.8",
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "32": "icons/thinkkeep_logo_32.png",
      "64": "icons/thinkkeep_logo_64.png",
      "128": "icons/thinkkeep_logo_128.png"
    },
    "default_title": "Open ThinkKeep"
  },
  "icons": {
    "32": "icons/thinkkeep_logo_32.png",
    "64": "icons/thinkkeep_logo_64.png",
    "128": "icons/thinkkeep_logo_128.png",
    "256": "icons/thinkkeep_logo_256.png",
    "512": "icons/thinkkeep_logo_512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*",
        "https://linkedin.com/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "tooltip.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "host_permissions": [
    "https://www.linkedin.com/*",
    "https://linkedin.com/*"
  ],
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "thinkkeep.html",
        "icons/thinkkeep_logo_32.png",
        "icons/thinkkeep_logo_64.png",
        "icons/thinkkeep_logo_128.png",
        "icons/thinkkeep_logo_256.png",
        "icons/thinkkeep_logo_512.png"
      ],
      "matches": [
        "https://www.linkedin.com/*",
        "https://linkedin.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@thinkkeep.app",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}