Interface Customizations

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Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (11)
17,308 users

Google Hangouts Web Messenger

Google Hangouts Web Messenger brings Google Hangouts right into your browser to chat with your friends.

Rated 5 out of 5 stars (4)
3,690 users

Stylish-Custom Requires Restart

custom additions to Stylish extension

Rated 5 out of 5 stars (6)
844 users

GNotifier

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 (28)
12,445 users

Profile Buttons

A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.

Rated 4 out of 5 stars (6)
1,208 users

Open With Internet Explorer

Open With Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.

Rated 5 out of 5 stars (2)
4,351 users

Fierr Requires Restart

Replaces the error page with a more stylish appearance with additional features.

Rated 5 out of 5 stars (51)
1,947 users

Open With Google Chrome

Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.

Rated 5 out of 5 stars (40)
10,040 users

Open With Opera

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

Rated 4 out of 5 stars (7)
1,291 users

KeePass Helper Requires Restart

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 (36)
4,114 users

SeaTab-X-2 Requires Restart

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (21)
2,003 users

FolderFlags Requires Restart

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (8)
3,183 users

Tabs Menu Requires Restart

Adds a Tabs menu to the main menu that lets you easily change between tabs.

Rated 4 out of 5 stars (32)
2,084 users

Forecastfox (fix version) Requires Restart

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Now Available for: Firefox, Thunderbird and SeaMonkey!

Rated 5 out of 5 stars (235)
57,858 users

Theme Font & Size Changer

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 5 out of 5 stars (169)
93,370 users

WebPG for Mozilla Requires Restart

An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey

Rated 3 out of 5 stars (24)
2,025 users

Active Stop Button Requires Restart

Stop gif animation with button, context menu or Esc key

Rated 4 out of 5 stars (42)
4,149 users

Tab Wheel Scroll

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

Rated 4 out of 5 stars (128)
9,588 users

Remember Mismatched Domains Requires Restart

The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...

Rated 5 out of 5 stars (66)
1,490 users

URLFilter

Block advertisement and access to adult sites

Rated 4 out of 5 stars (18)
2,962 users