Lets you choose a background color for plain images.

Changes soundcloud.com to a dark theme.

Stop the YouTube rabbit hole. Customize YouTube's user interface to be less engaging.

Adds Print, Print Preview and Save as PDF commands to the context menu.

Microsoft Teams, but better

Gmail reverse conversation view.
Do you like newest message on the top in conversation view? Now you can do it with this simple addon.
No javascript, css only.

Also works in new Gmail.

Access to your favorite websites via an stylish speed dial!

Control your browser's global screen brightness

Move tab to standalone window, without tabs bar, navigation bar and bookmark bar UI.

Replicate old YouTube look and features within the modern layout!

Displays server IP address on every website

Renames the Tab Title (Persistent across the sessions).
Renaming to add custom words in tab titles makes it easy to search for tabs in the address bar.

Additional functionality for your cycling and running analysis. This extension upgrades the Strava™ website.

Hides annoying YouTube comments.

Enhanced Tooltip functionality for Pokémon Showdown Random Battle formats.

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.

Watch videos on YouTube fullscreen within your browsers screen.

Switch website you want to dark mode. Dark mode will help devices save battery and reduces strain on your eyes.

A highly customizable dark charcoal/blue theme for YouTube

Moves the reload bar to the address bar like in Firefox before 57.

Source code available here: https://github.com/trubens/reloadInAddressBarExtension

Simple form filler.

Block popups, banners, chat widgets, notification bars, and more from appearing on any website.

Hides the YouTube™ fullscreen controls when moving the mouse to any border.

Automatically finds and highlights words and phrases on the web page according to your list

Put sticky notes on the web page.
Jump to sticky from sidebar.
Share stickies between browsers. (need login to server)

Removes Reddit 'PROMOTED' posts and advertisements in the feed and sidebar.

Best dark mode for Canvas, plus other features

strips away clutter like buttons, background images, and changes the page's text size, contrast and layout for better readability. Note: This extension uses the standalone version of Mozilla's Readability library.

Set default zoom level for Firefox.

Ever wish that Firefox didn't use color management when viewing images or video? Turn it off easily with this add-on.