Examine source code of Bookmark with Thumbnails

{
  "manifest_version": 2,
  "name": "Bookmark with Thumbnails",
  "version": "0.1.3",
  "description": "bookmarks viewer with feature to snapshot thumbnails from the webpages. Thumbnail capturing modes like normal/try auto-focus/select with mouse. Drag and move Bookmarks to your arrangement or different folder. Minimalistic ui with options to delete/rename/snapshot/copy link.",
  "permissions": [
    "bookmarks",
    "storage",
    "tabs",
    "clipboardWrite",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png"
  },
  "browser_action": {
    "default_title": "Bookmark with Thumbnails",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "background": {
    "scripts": [
      "idb.js",
      "storageLocal.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1ea164bf-b8a4-4e18-8b33-cb1e707aea18}"
    }
  }
}