SoundFixer
Helps you fix annoying sound problems on sites like YouTube: audio in one channel only, too quiet or too loud. (Unfortunately, this extension does not work on all websites because of cross-domain issues — but it does work on YouTube!)
35,788 users
4 users
Video Background Play Fix
Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.
181,380 users
600% Sound Volume
Up to 600% volume boost
150,226 users
Sound Adjustment
Easily adjust various sound settings (volume, balance, etc.) via toolbar popup.
4,597 users
Dark Background and Light Text
Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.
38,730 users
Notification Sound
Makes a sound when a notification is shown. Lets you customize the sound and which websites to show notifications for.
1,938 users
Download Sound
Plays a sound or utters a text using speech synthesis when a download is completed.
1,194 users
Sound Booster
Increase and amplify your max volume.
1,681 users
Undo Close Tab
Allows you to restore the tab you just closed with a single click—plus it can offer a list of recently closed tabs within a convenient context menu.
41,915 users
Go to Sound Tab
Takes you to the tab that is generating sound
239 users
Sound Control
Manage audible web pages from a central location.
439 users
0 users
Extra sounds
Extra sounds for your Firefox (Navigation, downloads, and more)
409 users
SoundCloud Downloader
Directly download tracks on soundcloud.com. Creates metadata tags for Title, Artists, Album & Artwork. Allows to block reposts in your Stream feed and more.
11,881 users
Duolingo Sound Controls
Provides fine-grained sound controls for Duolingo.
143 users
Sound Meter (Noise & Decibel)
Measure the surrounding sound (dB) and noise with your computer's microphone!
153 users
Simple Audio Voice Sound Recorder
Simple Audio Voice Sound Recorder let's you easily record & share your voice with everyone!
353 users
Firefox Multi-Account Containers
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs. Cookies are separated by container, allowing you to use the web with multiple accounts and integrate Mozilla VPN for an extra layer of privacy.
368,532 users
PopupSound
Plays a click sound when you click on a link. Also plays a trumpet sound when you finish downloading a file.
100 users
Mp3 Downloader for SoundCloud™
Add download link to all SoundClould tracks
12,787 users
600% Sound Volume (ads/tracking removed)
Up to 600% volume boost
585 users
SCDL SoundCloud Downloader
SoundCloud Download Helper. Adds ARTWORK, ARTIST, GENRE, TRACKNAME !! FIXED!! 04.12.2019
4,755 users
YouTube High Definition
YouTube High Definition is a powerful tool that automatically plays all YouTube videos in HD, changes video player size, offers auto-stop and mute, and much more.
162,397 users
SoundCloud Control
A browser extension that lets you control the SoundCloud player controls without switching tabs.
420 users