Examine source code of Fast Bookmark

{
  "manifest_version": 3,
  "name": "Fast Bookmark",
  "description": "Quick Save with Smart Folders",
  "version": "0.1.5",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png",
    "256": "icon/256.png",
    "512": "icon/512.png"
  },
  "permissions": [
    "activeTab",
    "bookmarks"
  ],
  "author": "rxliuli",
  "action": {
    "default_icon": {
      "16": "icon/16.png",
      "32": "icon/32.png",
      "48": "icon/48.png",
      "96": "icon/96.png",
      "128": "icon/128.png"
    },
    "default_title": "Fast Bookmark",
    "default_popup": "popup.html"
  },
  "homepage_url": "https://rxliuli.com/projects/fast-bookmark",
  "browser_specific_settings": {
    "gecko": {
      "id": "fast-bookmark@rxliuli.com"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+D",
        "mac": "Command+D"
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}