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mozilla-firefox-extension

Indicates bookmaked pages, bookmarks with similar URLs, duplicate bookmarks, and history information about the current tab. Experimental treemap view of all bookmarks.

Provides an pop-up menu, displaying the bookmark's path, and allowing quick moves to a choice of folders.

Extracts metadata from each page's HEAD, and makes it available to other add-ons, so they don't have to scan each page themselves

GitLab adjunct is a Firefox add-on that helps to use GitLab.

A collection of related button add-ons. Each one navigates to a page linked to the current page.

View Source Switch is a Firefox add-on that allows one click switching between "view source" and regular web page.

A non-intrusive QR code paste & decode Firefox add-on

The project is not for nor against Mozilla and this is by no means meant to smear Mozilla or their products - or their Dev Team - it is an overview.