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Add-ons Button
Opens the Add-ons window to perform tasks on your installed Extensions, Themes, Plug-ins and Language packs.
Restart App Button
Restart the current application, as you might need to do after installing a new extension or theme.
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
About:about Button
A button that lists all the about pages that exist. Some of these pages are also provided as separate buttons.
Add-on Preferences Button
Displays a menu that allows you to open the option/preference window for any add-on that has one.
Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
Standalone SeaMonkey Mail
Use SeaMonkey as a standalone e-mail client. Set up a default browser for links opened from Mail & Newsgroups.
BOINC Stats 2 Requires Restart
Displays your Total and Recent Average Credits for BOINC distributed computing projects in the status bar.
TimerFox Requires Restart
Easily counts down from a predefined number and alarms you when the count has reached zero.
WebODF
Viewer for OpenDocument Format office files. It can display documents saved from LibreOffice, OpenOffice, Calligra, Abiword, Microsoft Word, Excel, PowerPoint. The documents should be saved in the OpenDocument Format.
1-click Online Document View Requires Restart
Open DOC, DOCX, PDF, PPT, PPTX and TIFF files linked in any webpage directly with Google Docs viewer using "1-click Online Document View", with a single left-click of your mouse / trackpad!!
Focus Regainer Requires Restart
Return focus from embedded object back to browser on browser hotkeys pressed.
BBCodeXtra Requires Restart
(Sorry, no plans to port this add-on to Webextensions)
BBCodeXtra is an extension, compatible with Mozilla FireFox (up to 57) and Seamonkey, which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way...
To create your own collections, you must have a Mozilla Add-ons account.