This addon add usefull buttons in repo listing @ github

Makes code browsing on Github easy by showing outline of code.

Force a set of tabs to load at startup without being pinned tabs.

A simple yet powerful A11Y tool that gives you the ultimate freedom to easily customize any web page with a click of a button.

faZakkir is a simple extension that replace every new tab with a random verse from the Holy Quran whith its interpretation

Save a list of all open tabs into a text file. - This is a fork of Export Tabs URLs with support for firefox android

Show latest exchange rates every time you open a new tab. The rates are set by the National Bank of Romania, updated daily.

More, through the app converter form, you can easily convert any supported currency to RON.

Adds right-click-context-menu which opens currently selected Youtube video link in newtab of your site that opened in browser 2nd tab

adds button on tumblr to dump all of your tumblr drafts

Declutter your browser by snoozing tabs until you need them.

Set times to open tabs only once daily

Change the new tab URL to a custom one.

Makes Ctrl/Cmd-click not switch focused tab for rel="external" links.

Connects to WorkSmart for URL tracking

Creates tabs with filled forms, making testing easier. Register URLs from web projects (localhost). For each registered page, add form input combinations. "Create Test Tabs" button creates tabs with forms filled in based on the combinations.

Add CommonUnits time to new tab and toolbar.

Shows the amount of duplicate tabs the current tab has and allows to quickly and easily close them

Add a button to close the current active tab (dark/yaru icon).

Holds clipboard data for easy access.

This addon monitors your clipboard and automatically appends its content onto any tab on which it's been activated. This addons works on firefox version 54.0 and later.

Concatenates selected text or link to clipboard entity

Close all your tabs and reduce links to a self contained site with all your urls.

Manage multiple persistent sets of tabs.

Remember to breathe. This extension shows you a simple message of your choice every time you open a new tab. You can create a list of messages that the extension will randomly choose from. You can also change the colors and fonts of the message.

This plugin makes it easy to find information on the medium.
This adds a new toolbar button.
If you are viewing a specific article in Medium, pressing the toolbar button will attempt to launch the page and send you to the next tab.

A newtab browser plugin with modular and re-arrangeable widgets.

Blazing Tabs is a blazing fast tab switcher. All your opened tabs are searchable by title and domain.

This add-on is displaying a pop-up in the browser where the user can add some notes. Also, exists the possibility of deleting the notes if the user does not need them anymore.
Once inserted, the notes will remain saved in the local storage.

Appends custom string to current domain name. Source code available at: https://gitlab.com/sabian2008/append2domain

Aloha replaces your boring looking new tabs with beautiful Photos and Quotes.