Astronomy Picture of the Day as a Popup in your Browser!

Use your tab bar as a playlist for youtube videos!

Open YouTube playlist videos without the playlist in a new tab.

Lightweight Firefox web extension to automatically change the video quality to max.

Web Clipper for Allusion - for organizing your Visual Library

Skips/mutes/blanks selected parts of streaming videos

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Automatically skip intros and goes to the next episode on Netflix.
Also clicks "are you still watching" dialogs.

SideApp For Instagram
SideApp For Instagram Allows You To Open Instagram In The Sidebar Or In A New Window.
Instagram Is Not Affiliated With The UNITY Empire
And Is Not A Product Of The UNITY Empire.

LoopiFy YouTube videos.
Using this tool you can make auto loops to youtube videos.

Mux video and audio files from selected formats inside your browser!

Adds a context menu to save media {image, video, audio, link, selection, page} in user-defined directories relative to the default download location. Save into dynamically named directories. Rules-based download renaming and routing.

Extension for applying a color filter to limit exposure to blue light, for example

This is a browser extension that encodes and decodes media to and from Base64.
EDIT: Can only convert FROM Base64 due to Firefox limitations I am currently working to circumvent.

More information: https://github.com/dandeto/Base-64-Extension

Plays YouTube Shorts in the normal YouTube player so you can rewind the the videos.

Watch videos from video sharing websites with extra options.

Lyrics for your favorite songs on your favorite sites! Now supports Spotify (Web), Youtube, YT Music and Google Play Music.

Watch Youtube privately on Invidious. Zero requests to Youtube, even with embedded videos. You can set dark mode, individual URL, proxy mode and more.

It is easy to take pictures from other websites and send them to Yupoo. It is an official browser extension provided by Yupoo.

Enhance user experience on Youtube

Converts text to speech

Ambient sounds for your Firefox.

This add-on increases the display size of videos by removing unnecessary padding bars.

See the latest and most popular CNN Video

View the Latest News Videos Daily. Free-to-watch videos daily in just 1-Click.

Addon uses 3rd party site (www.supernewsworld.com) for operation.

For direct image links, this will automatically fetch and replace the URL for the max resolution image. For direct social media posts featuring media, this will add a download button to fetch the image or video.

The best way to download songs from YouTube.

YouTube™ Livestream Mode - ENHANCE and SPEED UP for the your viewing YouTube live stream (Football, Game, ...) for slow internet connection.

YouTube title untranslator

Adds download button for subscription list in xml format.

No longer supports upgrade . Please see https://addons.mozilla.org/ru/firefox/addon/boost-youtube/.
On YouTube Player page, in address bar is adding icon. Click it and open new Tab with maxresdefault.jpg

Discover a Deezer Track every time you open a new tab.