Lightbeam
Lightbeam is a Firefox browser extension that uses interactive visualizations to show you the relationships between third parties and the sites you visit.
2,554 users
Snooze Tabs
Snooze Tabs help you focus your attention online, whether you want to remove distractions for now or save something for later. Hit the snooze icon to dismiss tabs you don’t want now, and set an alarm to bring them back when you need them.
2,532 users
Old Twitter Layout (2025)
An extension that returns old Twitter's look from 2015 or 2018. WORKS IN 2025!
2,526 users
Reddit Enhancer
Various tweaks to customise your Reddit experience. Supports all versions of Reddit.
2,517 users
Arsenal - Support Extension
Many Helldivers 2 mods require manual installation, which can be time-consuming, especially when updating mods. This extension adds a dedicated button for each Nexus Mods Helldivers 2 mod, sending downloads directly to your HD2 Arsenal client.
2,480 users
Keep Awake (Screen Only)
Keep your computer's screen from turning off with just one click.
2,477 users
doqment PDF Reader
Firefox's PDF Viewer with Reader Mode: change the colours of PDFs while reading.
2,461 users
YouTube™ dual subtitles
Automatically switch to local language, bilingual subtitles, subtitle download, subtitle dubbing, custom subtitle style. Default subtitles: Set the translation language.
2,436 users
Personal Blocklist (not by Google)
Blocks domains/hosts from appearing in your Google search results.
2,433 users
Merge Windows
Merges the tabs from multiple windows together into one window. Extension won't show context menu item when there aren't more than one window of the same type to merge together. Private windows will only merge with private windows not normal.
2,427 users
Mobile Dyslexic
Mobile Dyslexic replaces all fonts of all web pages with carefully crafted special font which is easier to read by people with dyslexia.
2,397 users
Open Subtitles
Add subtitles to any HTML5 video sites such as Youtube, Netflix, Amazon Prime Video, Disney+, HBO Max and other stream sites.
2,373 users
Basic JSON Formatter
Adds a page action to pretty-print JSON. Unlike similar extensions, this simply pretty-prints it. It doesn't add any kind of viewer, colors, or collapsing. If you want this to work as expected, disable devtools.jsonview.enabled in about:config.
2,314 users
Highlight This: finds and marks words
Automatically finds and highlights words and phrases on the web page according to your list
2,311 users
Popupblocker
Popupblocker can block every popup. Many websites open new windows with ads, when you try to mark text or click something. This add-on will block these and show a really small notification.
2,304 users
Better Lyrics (Lyrics for Youtube Music)
Enhance YouTube Music with beautiful time-synced lyrics, multilingual support, real-time translations and more
2,287 users
Copy All Tabs
Copy All Tabs takes the address and title for each tab and creates a text list of links. The list is copied to your clipboard so you can paste it to your notes. You can also open tabs from a previously saved list of links. Similar to CopyAllUrls.
2,272 users
