Allows changing to a different tab by pressing Ctrl and a number at the same time.

Primarily useful on Linux, where the default is Alt+number.

Partial replacement for my Windows Shortcuts extension for Firefox 55 and above.

Copy tabs as hyperlinks or as plaintext URLs, similar to MS Edge, but actually even better since this addons supports copying mutliple tabs at the same time.

Limit the width of webpages for a better widescreen experience

Reloads specified tabs on idle to reduce memory usage.

Opens a new tab like the original new tab button or the shortcut (Ctrl+T)

Universal manager for Firefox. Manage your tabs, bookmarks, history and clipboard using powerful filtering and sorting capability. Easily select multiple items and handle them at once.
Formerly named as At Your Command.

Scroll pages in VIM style, using j and k shortcuts.

Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.

Make a new tab your own with custom background color, wallpapers, redirection, and other tweaks.

Lenny Faces keyboard helps you create and copy/paste Lenny Faces to anywhere.

A simple text editor to help you focus on your writing.

URL Alias allows the user to define a short alias for a url, in order to access websites faster from the address bar.

Open Tab, Page or Link in incognito mode.

Nowsync is a professional bookmark management tool. Bookmarks can be quickly and timely synchronized between different computers and browsers.

Create a new tab in the container in the Simple Tab Groups v4.5.2+ extension

Single click the icon to play/pause the leftmost YouTube tab, double click to skip. The icon shows elapsed time and video length.

This extension creates a qrcode for the current url.

When you can't wait but have to.
Use this extension to countdown to your next favourite moment on every new tab. Along with the countdown you'll get a fresh background photo each time based on your search terms.

Extension to search for and switch between tabs in seconds with a simple shortcut.

Solve your tab addiction with a quick game of space invaders. Each destroyed alien will close an opened tab.

This extension shows a notice about the site in current tab if it's blocked by government in Russia.
If domain or ip in current tab is blocked, the extension will change icon to red color.
For example: rutracker.org is blocked, google.com is not.

Adds a "Go Up" button for Firefox

A list of useful operations, like moving, closing, zoom, duplicate that you can perform on a tab.

Scrolls instantly to top.

Open tabs from the content of the clipboard, allows to open large number of tabs simultanisouly, by loading them in a discarded state, meaning that they will load the content only when they get selected

Next tab only a click away!

When on a IMDb page, click button to go to corresponding letterboxd page.
There was once an addon like this but it got removed(?).
Redirect based on https://bookmarkify.it/6479

Edit an HTML element and all its child nodes in VIM text editor with real-time updates

It adds https to the current http URL. For instance, if your current tab is on http://example.com, clicking this add-on icon will take you to the https://example.com. If you're already on a https version, it will take you to the http.

Close Tabs to the left, now in your browser.

Add a context menu for tabs that closes all tabs to the left of the selected one.