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Send to Internals
Requires Restart
Provides a special button to send mail to internals. "Internals" may be company, organization, or user group and so on.
Return Receipt Toolbar Button
Requires Restart
Allow you to add a Return Receipt button to mail compose window toolbar.
Advanced Unread Folders
Requires Restart
Adds a folder view showing unread folders, including their hierarchy. This is helpful if you have a lot of folders to make sure you don't miss an email, or if you are not happy with the existing unread folders view.
Locale2MUI
Requires Restart
Sets Firefox/Thunderbird Locale to Windows (MUI) Language on startup
Reply As Original Recipient
Requires Restart
Reply with the From: field set to the To: field from the original email.
Read2Me "speechify the web"
Requires Restart
Webpage and email to speech extension using festival or any speech engine that can handle plain text files. This version has removed the option to use the embedded Flite-1.4 component on linux.
Personal Level Indicators
Requires Restart
Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.
Rikaichan Japanese-Hungarian Dictionary File
Requires Restart
This is a dictionary file add-on for the Rikaichan extension.
Column Reader
Web reader for wide screens and long documents. Read with pleasure in attractive layouts.
Extension List Dumper 2
Requires Restart
This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...
MyAdFilter
With MyAdFilter, free content creators propose you only one ad. Apart from those, as your usual ad-blocker, MyAdFilter disables all ads.
Eesti keele speller
Estonian spellchecking dictionary for Firefox, Thunderbird and Seamonkey...
Slideshow
Requires Restart
Displays a slideshow of picture attachments. When email has attached pictures, it displays "View as Slideshow" button next to the attachment. Button click pops a slideshow window with all the images, allowing you to zoom in/out, save...
WordReference Translator
Requires Restart
Open a tab with WordReference's translation for the selected word. Through a floating link, or by pressing "D" key.
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