Link Password - Password Protect System For Bookmarks And Links.
Do you sometimes need, and password-protect individual bookmarks or link.
Perhaps a link to a secret site that no one else will be able to follow.

Displays anchors for all content in the current web page without breaking the layout.

Symbaloo Extension for setting Symbaloo as the Homepage in your FireFox Browser.
With Symbaloo you surf with one click to all of your favorite websites.

Bookmark and restore Tree Style Tab data.

Easily access to recent clipboards via context-menu or toolbar popup.

Send to Bear.app snippets, URL or entire web pages

Chrome bookmark manager for firefox.

Redesigned new tab page featuring your bookmarks, most visited, recently closed, and weather in a custom layout.

Allows you to manage and save tabs

Add a custom search engine and export/import all the search urls and icon urls for all search engines added to Firefox.

Make bookmarks or capture web pages into local storage and manage bookmarks and captured pages in sidebar. Compatible with ScrapBook documents. Win/Mac/Linux supported.

AIO Search Firefox Toolbar provides you with an enhanced toolbar for searching on the web by categories and shows results in tabs on www.aiosearch.com .The add-on comes with 'keyword highlighter', 'keyword auto-complete' and context menu options.

Search from the context menu! Right click on some selected text, a link text, or an image – search for it on the engines of your choice. Manage your search engines easily with the native Firefox bookmarks manager.

Replace your new-tab page and home page with your bookmarks. No ads, no speed dials, no frequently visited or other "frecency" bullshit! Just your own, predictable grid of links.

Add-on for quick bookmarking.
Allows to add or remove links in one click to read it later.

Play 2048 anytime you want, it's always in your browser!

Add anotations in a webpage, that will be available in your next visit. There are different kind of anotations, as sticky notes, multimedia recordings (audio/video) or text highlighting. Export and share your anotations.

ytmate.tools is a converter & downloader can deal with videos from YouTube, Facebook, Video, Dailymotion, Youku, etc. to Mp3, Mp4 in HD quality. Ytmate supports downloading all video formats such as: MP4, M4V, 3GP, WMV, FLV, MO, MP3, WEBM, etc.

Allow Firefox to save "no-store" site icons and get rid of the globe icon for bookmarks. Please read the description before installing.

Saves the links of all open tabs and allows for one by one or all together restoration.

This add-on allows to replace or update an existing bookmark title and/or URL with a minimal click count..

Set your open tabs aside and store them for later.

They will be stored in a new folder in your bookmarks and can be restored all at once via the sidebar.

https://github.com/tim-we/tabs-aside

Companion extension for the linkding bookmark manager

Official Pinboard.in Firefox Extension

A two-panel bookmarks manager which is similar to the well-known Total Commander.

An unofficial extension to collaboratively annotate the web using Hypothesis.

Fast Tab Switcher allows you to find and switch to any tab immediately. It is very useful if you have multiple windows and/or lots of tabs opened. Just press Ctrl+Space!

100% free and will convert and create various types of files (such as Word DOC, Excel XLS, and PowerPoint PPT).

Saves any WebPage as PDF quickly with a click on the PDFmyURL button.

Highlight and comment web pages.
Your highlights are stored in your browser bookmarks, automatically recreated when you revisit a web page.