Interface Customizations

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IE Tab + (FF 8+, 7, 6, 5, 4, 3.6, 3.5, SeaMonkey)

IE Tab + is an enhanced version of IE Tab. It supports FF 3.5 or greater, integrates IE Tab with Adblock Plus in the IE Tab engine, and synchronizes cookies between IE and Firefox. You can easily import settings from the original IE Tab into IE Tab +

Rated 3 out of 5 stars (87)
529 weekly downloads

JSONovich No Restart

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Rated 4 out of 5 stars (36)
515 weekly downloads

Password Tags

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (7)
472 weekly downloads

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (191)
451 weekly downloads

GNotifier No Restart

Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.

Rated 5 out of 5 stars (13)
401 weekly downloads

Open With Opera No Restart

Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.

Rated 5 out of 5 stars (4)
351 weekly downloads

Tab Wheel Scroll No Restart

Switch tabs by scrolling with the mouse wheel in the tab bar.

Rated 4 out of 5 stars (113)
351 weekly downloads

Right Links

This extension allows to open links in new tabs with right-click directly and using “long” left-click.
This is very useful for touchpads on notebooks and for mice without middle button.

Rated 5 out of 5 stars (124)
344 weekly downloads

Stylish Sync No Restart

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (25)
312 weekly downloads

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (101)
312 weekly downloads

lolifox - Fierr MOD

Replaces the error page with a lolifox appearance with additional features.

Rated 5 out of 5 stars (20)
304 weekly downloads

Display Mail User Agent

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (104)
299 weekly downloads

Linkification

Converts text links into genuine, clickable links...

Rated 4 out of 5 stars (309)
286 weekly downloads

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (15)
277 weekly downloads

Add-ons Manager - Version Number No Restart

Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.

Rated 5 out of 5 stars (18)
273 weekly downloads

Restartless Restart No Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (213)
245 weekly downloads

True Full Screen in SeaMonkey No Restart

This extension enables true full screen mode in SeaMonkey for HTML5 video players, slide-shows, etc. and also for full screen invoked manually with the F11 key.

Rated 5 out of 5 stars (16)
238 weekly downloads

Dorando keyconfig

A modified Dorando's tool to rebind keys in Mozilla apps. It is designed to be a drop-in replacement, and will keep your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) works again!

Rated 5 out of 5 stars (14)
211 weekly downloads

Duplicate This Tab

This add-on provides the much needed feature update of Tab Duplication to Mozilla Browsers. Features Supported include Duplication of Browser Tabs, Detaching Tabs and Merging All Windows.

Rated 4 out of 5 stars (43)
185 weekly downloads

KeePass Helper

Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.

Rated 4 out of 5 stars (34)
177 weekly downloads