Examine source code of Marquer - Bookmark Sharer

{
  "manifest_version": 3,
  "name": "Marquer - Bookmark Sharer",
  "version": "1.1",
  "description": "Export and import bookmark collections to share with friends",
  "permissions": [
    "bookmarks",
    "storage",
    "downloads"
  ],
  "icons": {
    "16": "icons/marquer-16.png",
    "48": "icons/marquer-48.png",
    "128": "icons/marquer-128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Bookmark Sharer",
    "default_panel": "popup.html"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      },
      "description": "Open Bookmark Sharer Sidebar"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shmdsgn@gmail.com",
      "strict_min_version": "58.0"
    }
  }
}