Offline Read Later list manager, with which you can save the current page, using the popup.
Unlike other add-ons, you can also drag links anywhere to save them (instead of using the context menu)
https://github.com/naoric/drag-to-save-ff

Enable you to play youtube links inside facebook

Use this add on to go to next pages in forum without clicking tiny page numbers

Gets back Twitter's old design by changing the user-agent string.

This add-on re-implements the tab bar from desktop we all love, on Android tablets, on Firefox.
It has all the familiar buttons like back, forward, reload and new tab. You can scroll the list of your opened tabs, you can close or duplicate tabs

Currently logs all URLs accessed by the app (into app console & into standard output stream (using dump()), whether the request is explicitly made by the user or automatically made by the app itself.

Control Youtube playlist without visiting the tab.

switch between webpage and google web cache.

Automatically download files over a certain size in Maxel, or open the current page in Maxel's built-in browser. You can also select links you want to download, right-click, and choose "Download selected links in Maxel.

Clears the Firefox browser history automatically on browser start. You can also schedule to clear Firefox history periodically.

Makes the visual appearance of Twitch chat more basic.

Use your context menu on Twitch to:
* Set nickname colors to black (white in dark mode)
* Remove badges and/or images
* Grayscale images

Provides your current ip address, city, postal, weather forecast. You can also query other ip address.

A simple extension that counts the number of links on the current page.

Удобный инструмент для отправки туристам списка туров с ценами по e-mail или смс.

Quickly get QR Code for currently open page.

Project sources published at https://github.com/chall3ng3r/QRCoder-Firefox

Boost your productivity by quickly navigating through your open tabs, history and Tefter.io bookmarks.

This addon is deprecated, please use https://addons.mozilla.org/firefox/addon/new-bing-anywhere/
这个版本的插件不再推荐使用，请从新的地址重新安装 https://addons.mozilla.org/firefox/addon/new-bing-anywhere/

New Bing isn't just for Edge anymore. Anywhere you want

Tired of receiving page notifications or being bothered by them asking permission to send notifications? Don't bother with that anymore!

Detects whether a website is using Flexbox

An attempt to capture every WebExtensions event and log it to the Browser Console.

This extension paints page content in black. You can interactively (like in DevTools) select element on current page which must be more contrast then click on him and his color will become black.

select base64 text to decode

You can now use DuckDuckGo as your default search engine and when DDG misses the results, a handy google link is presented in the page. Check the FEATURES section bellow.
Labrador by Shirley Hernández Ticona, DO

Disguises /r/subredditsimulator posts as real posts

Easy Play Snake Game for Golden Age for your browser.

This add-on makes it easy to select a block of texts, especially the programming code which sometimes hard to be selected when the edge of text is narrow.

Have fun by replacing text for the web

The new generation tab manager.
Manage your tabs just like bookmarks.
Archive or close a bunch of tabs in one click just like beast!

Adaptheme is a UI design tool to help designers visualize a web site with with a matching browser toolbar color that adapts to the site page. It takes the color from the "theme-color" attribute.

I'm allowing you to use, usefuls tools all along your search ! Without leaving your current page !