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Session Manager
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
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.
Addons Manager Hilite
Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.
Extension Auto-Installer
Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.
Toggle Development Profile Prefs
Toggles Development Profile Preferences On When Enabled And Off When Disabled.
TabSubmit
Lets the user direct the submission of a form to a new tab or window. [Bug #17754]
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.
Open RegEdit Key
[WINDOWS ONLY] Open selected registry key directly in the registry editor from context menu.
Add-ons Sync Prefs
Reddit HistoryTo create your own collections, you must have a Mozilla Add-ons account.
