Miscellaneous

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Font Finder Requires Restart

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (75)
39,153 users
Updated December 1, 2016

Classic Toolbar Buttons

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.

Beta builds on versions page!

Rated 5 out of 5 stars (161)
40,264 users
Updated November 29, 2016

ThunderKeepPlus

Google Keep for Thunderbird

Not yet rated
167 users
Updated November 28, 2016

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 4 out of 5 stars (229)
99,563 users
Updated November 28, 2016

Ad-Blocker

Ad Blocker lets you block all ads, tracking & malware from the web world. It is an effective solution to browse the web without offensive and annoying ads you hate to see.

Rated 4 out of 5 stars (8)
40,986 users
Updated November 24, 2016

The Adblocker Project

A powerful ad blocker that blocks ALL ads but ads from publishers who shares revenues with targets YOU choose.

Rated 5 out of 5 stars (3)
251 users
Updated November 18, 2016

Add Signature Requires Restart

Simply add your signature manually (right mouse click) to your emails

Rated 3 out of 5 stars (36)
9,322 users
Updated November 7, 2016

Element Hiding Helper for Adblock Plus

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

Rated 5 out of 5 stars (453)
605,894 users
Updated October 26, 2016

Deselect on Click 1.0 Requires Restart

Deselects current message when clicking in thread pane.

Rated 5 out of 5 stars (2)
140 users
Updated October 24, 2016

Force Addon Status Requires Restart

Provides ability to change status of specific addon (enabled/disabled).

Not yet rated
1,243 users
Updated October 24, 2016

Nightly Tester Tools Requires Restart

Useful tools for the nightly tester.

Rated 4 out of 5 stars (194)
26,705 users
Updated October 21, 2016

DOM Inspector Plus! [dm] Requires Restart

Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.

Rated 5 out of 5 stars (5)
572 users
Updated October 21, 2016

NewScrollbars (aka NoiaScrollbars) Requires Restart

The "NewScrollbars"-extension replaces default scrollbars of Firefox and Thunderbird with colorized ones (partly) known from "Noia themes".

Rated 5 out of 5 stars (106)
17,740 users
Updated October 14, 2016

Auto Compress File Requires Restart

Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).

Rated 5 out of 5 stars (19)
6,064 users
Updated October 11, 2016

PathExplorer Requires Restart

Adds "Open with Explorer" to the message pane's right-click menu.

Not yet rated
67 users
Updated October 11, 2016

Auto Resize Image Requires Restart

Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).

Rated 4 out of 5 stars (26)
17,108 users
Updated October 9, 2016

LightningButton Requires Restart

Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.

Rated 5 out of 5 stars (14)
21,241 users
Updated October 7, 2016

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (13)
2,919 users
Updated October 4, 2016

Download Status Bar

If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.

Rated 5 out of 5 stars (337)
239,952 users
Updated September 26, 2016

Just Restart! Requires Restart

Restart application with Ctrl+Shift+Z.

Rated 5 out of 5 stars (4)
980 users
Updated September 24, 2016