Personal Blocklist (not by Google)
Blocks domains/hosts from appearing in your Google search results.
2,524 users
Music Mode for YouTube™
Hides the video and thumbnails on YouTube. Blocks the video keeping only the audio on YouTube Music. Additionally, it removes the ads from YouTube and allows YouTube to play in the background on mobile. Easy to use with many options.
2,480 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.
2,476 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.
2,402 users
Open Subtitles
Add subtitles to any HTML5 video sites such as Youtube, Netflix, Amazon Prime Video, Disney+, HBO Max and other stream sites.
2,398 users
Highlight This: finds and marks words
Automatically finds and highlights words and phrases on the web page according to your list
2,386 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.
2,379 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.
2,375 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.
2,339 users
Reddit Enhancer
Various tweaks to customise your Reddit experience. Supports all versions of Reddit.
2,338 users
Old Twitter Layout (2025)
An extension that returns old Twitter's look from 2015 or 2018. WORKS IN 2025!
2,335 users
Vertical Tabs Reloaded
This Firefox add-on arranges tabs in a vertical rather than horizontal fashion. Hide and display manually the tab sidebar with a hotkey (Ctrl+Shift+V) or by clicking on the VTR icon.
2,305 users
doqment PDF Reader
Firefox's PDF Viewer with Reader Mode: change the colours of PDFs while reading.
2,271 users
