Examine source code of Bookmarks+

{
  "manifest_version": 3,
  "name": "Bookmarks+",
  "description": "Quick access to your important bookmarks",
  "permissions": [
    "storage",
    "alarms"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab/newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab/newtab.html"
  },
  "sidebar_action": {
    "default_title": "Bookmarks+",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+S"
      },
      "description": "Toggle the Bookmarks+ sidebar"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmarksplus-ext@mirkokoester.de",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "version": "1.2.1"
}