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2532 apps in user-interface

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Tab Counter Icon

Shows number of open tabs as icon.

Steam Linkfilter Skipper

Skips the annoying 'You are leaving Steam' notice when you click on a link in Steam chat.

e621 Subscriptions

Adds Watched/Subscribe feature to e621.net

MineBlock

This extension will find and remove js miners

HoldTab

Delays new tab loading until you activate it

Start Page - Time & Date

Display bing.com's daily wallpaper on new tabs as well as date and time.

Peekier search engine

Adds a search engine that searches peekier.com

Puzzle

Puzzle - a puzzle game in which to create the mosaic of the plurality of pattern pieces.

LinkedIn Overlay Remover

Removes the overlay that displays over a linkedin profile.

Project Plans editor

Create and edit project plans with ProjectLibre online

Check iframe

Firefox add-on that indicates if the current web page uses iframe and frame tags. Icon:
-Blue: not checked.
-Green: no tags.
-Orange: tags.
-Purple: source list matches.
The add-on can scroll and redirect to the tag elements.

Sticky Containers

New tabs and windows will have the same container as the current tab. Links opened from external programs will also try to keep the same container as the tab which had focus.

Messenger & Notifier for Facebook™

provides an easy access to messenger.com and notifies you of all new messages (via badge icon text)

View Page Source (Mobile)

Adds the ability to open the page source in a new tab via button (Desktop) or menu (Firefox for Android).

Activate Left Tab On Close

When the currently active tab is closed, always switch to the one on the left of it.

YouTube Like-Dislike Shortcut

Shift+Plus to like, Shift+Minus to dislike. Can't get any simpler.

Tabs manager

With this extension handle your opened tabs, order them by title or url, find duplicated ones matching the same urls.

Everything Right

Open all new tabs on the right end of the tab bar.

Live Editor

This editor is used to display and check your HTML and CSS code easily. Just click on the this Extension Icon on the toolbar and it will open the Editor in the New tab. This will save the time of the Front end Developers.

APIdog Plus

Расширение, позволяющее расширить возможности работы сайта APIdog.

YouTube next chapter button

Adds a button to the YouTube player to fast-forward to the next section of the video

Timeneye widget

Track your time directly from Firefox in all your favourite tools.

Streamlink Helper

Lets you open links with streamlink.
READ https://github.com/plneappl/streamlink-helper/ ! THIS ADDON DOESN'T WORK WITHOUT YOU READING AND FOLLOWING THE INSTRUCTIONS ON THAT SITE!

Reload page in URL bar

Add a reload page button in the URL bar. Works with Light & Dark themes.

Click to Call

A lightweight extension that enables 'Click to Call' by converting phone numbers into clickable links.

Automail

A collection enhancements for Anilist.co

Improved notifications, more stats, a list comparison feature, scores in the feed and 60 other configurable modules.

Youtube Line

Addon locks the YouTube player timeline. Now when player controls disappear, you can see the video timeline.

Text to Speech

Read any selected text in the browser with human-quality text-to-speech (TTS) engines

Startpage.com Enhancer

Make Startpage.com more awesome!

Focused YouTube

Stay focused by removing video suggestions and promotions from YouTube making it clean and distraction free