Examine source code of UniMark

{
  "name": "UniMark",
  "version": "2.1.0",
  "description": "Universal Bookmark Manager",
  "host_permissions": [
    "*://*/*"
  ],
  "permissions": [
    "storage",
    "tabs",
    "contextMenus",
    "bookmarks"
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{35bd6b3d-157e-47f7-bb89-3987319d6eda}"
    }
  },
  "manifest_version": 3
}