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Quick Preference Button is a Mozilla add-on that provides quick access to common preferences through a menu button.

Sidebar Icons is a Firefox extension that adds bookmarks, history, and downloads icons to the sidebar title bar, improving the user's navigation experience. It is compatible only with Firefox.

Metapad is a Firefox add-on that seamlessly integrates Metadata text editor into your browser for easy access and use.

Open Dom Inspector from Inspect menu and analyze a node effectively. It's a helpful tool for web and extension developers to examine pages and Chrome. However, ensure that you have already installed Dom Inspector.

The About Button extension provides quick access to about:config and other options through a toolbar button and context menu. It opens the extension page in the current tab and other options in a new tab.