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Ultrawidify

Aspect ratio fixer for Youtube. Allows improperly encoded videos to properly fit wider displays (e.g. 21:9)

Rated 5 out of 5 stars (12)
1,417 users

Noise Requires Restart

Make sound responses while events happen.

Rated 4 out of 5 stars (41)
1,534 users

Emoji Keyboard (2016) by EmojiOne™

The must-have emoji extension of 2016! The easiest way to search, 1-click copy & paste, or auto-input emoji anywhere in Firefox.

Rated 3 out of 5 stars (18)
1,319 users

Dark TwitchTV

A Dark Theme for TwitchTV

Rated 5 out of 5 stars (4)
1,458 users

YouTube use Flash Player

Force YouTube to use Flash player over the HTML5 player

Rated 5 out of 5 stars (38)
5,955 users

Hide Caption Titlebar Plus

"Maximize your screen space by adjusting Firefox window TitleBar, borders, Tabs, Toolbars, etc!", with 'smart' options, *optional* custom caption & resizers.  
Multiple Configurable Actions for both screen-corner buttons: Firefox & Close buttons!

Rated 5 out of 5 stars (412)
30,176 users

Mozilla Labs: Prospector - OneLiner

Combine the navigation bar and tab bar into one line with a button for search.

Rated 4 out of 5 stars (71)
1,035 users

Literal - PDF Reader

Literal replaces Firefox's default PDF reader with a cloud connected and unobtrusive user interface. Keep track of your reading activity, history, and progress automatically, integrate with cloud storage, and upgrade your e-reading experience.

Rated 4 out of 5 stars (1)
1,236 users

disablemenu Requires Restart

This extension allows you to show/hide the main menu. It can be accessed through a toolbarbutton, keyboard shortcut and popup-menu-item. It also supports autohide. the statusbar can optionally be hidden.

Rated 5 out of 5 stars (58)
1,667 users

Blank New Tab

Use a blank page as your new tab page.

Rated 5 out of 5 stars (4)
1,448 users

CheckBoxMate Lefedor Edition Requires Restart

Check multiple checkboxes by drawing a rectangle around them. FF6 version.
I've made this version since i did need it for use with RTM,

Rated 4 out of 5 stars (14)
1,072 users

mFull: Full Screen Mode for Firefox Requires Restart

Firefox in Full Screen mode with many extra options, such as optionally display the guides or for example the address bar. Saves the last state or force start in full screen forever! Simple and complete for this purpose.

Rated 5 out of 5 stars (9)
6,719 users

Flash Gestures

Use your favorite mouse gesture add-on and Firefox hotkeys on plugins like Flash Player.

Rated 5 out of 5 stars (20)
10,742 users

Invert Colors

A simple FireFox add-on that inverts the web page colors to make pages easier to read in darker settings.

Github repo: https://github.com/Max-Github/FireFoxInvertColors

Rated 4 out of 5 stars (10)
1,504 users

AdBusters - AdBlocker + Ad-O-Meter

- Really ad-free, no deals with advertisers
- Ad-O-Meter shows you how ad-heavy a page is before you open it
- Includes preconfigured anti-adblock-killers and stealth mode
- Easily installed in three clicks no need to sign-up or register

Rated 4 out of 5 stars (3)
1,179 users

WebToPDF Requires Restart

Generate a PDF from webpage. Convert Webpage to PDF or Image. It will add all the contents of webpage even not in visible area . No Server processing.Supports different resolutions.

Rated 4 out of 5 stars (30)
17,942 users

Card Color Titles for Trello

Show the card label titles on trello.com

Not yet rated
1,058 users

Open in IE

This add-on enables you to open a link or the current page in a new Internet Explorer window. No more copying and pasting links for those sites that refuse to function correctly in Firefox!

Rated 4 out of 5 stars (51)
11,081 users

App Button Remove

Remove the orange Firefox button from the title bar.

Rated 5 out of 5 stars (24)
1,705 users

Beyond Australis Featured

Australis was the code name for the current Firefox theme, it aimed to make a great browser look awesome. Now you can go one step further and also make it feel awesome to use!

Rated 5 out of 5 stars (342)
39,566 users