Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
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Choose from thousands of extra features and styles to make Firefox your own.
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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.
Disable Add-on Compatibility Checks
Reinstates the extensions.checkCompatibility preference without respect to the current application version.
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.
Page Content Estimator
IPvFox
List the hosts, and corresponding network addresses, from which a page and its resources are loaded.
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.
Togglify Add-on Toggler
Adds toolbar buttons for each restartless add-on (including user scripts and plugins) to toggle its enabled state.
To create your own collections, you must have a Mozilla Add-ons account.
