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Slowness, crashing and more can be fixed by restoring Firefox to its factory settings. This easy process saves important things like bookmarks and passwords.

Over time Firefox can develop problems like slowness, crashing, unwanted toolbars and more. [[Basic Troubleshooting|Troubleshooting and fixing]] these issues can be difficult and time consuming. The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. {for not fx13} [[Template:ApplytoFx|channel=release|slug=firefox]] {/for} __TOC__ =What does the reset feature do?= All of your Firefox settings and personal information is stored in your [[Profiles|profile folder]]. The reset feature works by creating a new profile folder for you while saving your: *Bookmarks *Browsing history *Passwords *Cookies *Web form auto-fill information In the process the following things are either not saved or set to their defaults: *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Customizing Firefox with add-ons]] for help. *Open tabs, windows and tab groups: The reset process will close all open websites. Since your bookmarks and browsing history are saved you should still be able to easily return to your favorite sites. See [[How do I use bookmarks?#w_where-can-i-find-my-bookmarks|Where can I find my bookmarks?]] and [[Location bar autocomplete]] for more info. Also, since your [[Cookies|cookies]] are saved, you shouldn't be logged out of any websites you were logged into before the reset. *Site-specific preferences, search engines, personal dictionary, download history, DOM storage, security certificate settings, security device settings, download actions, plugin MIME types, toolbar customizations and user styles are also not saved. See the [[Profiles]] article for more information about these. =How do I reset Firefox to its default state?= {for win} #At the top of the Firefox window, click the {button Firefox} button, go over to the {menu Help} sub-menu<br> (on '''Windows XP''', click the {menu Help} menu at the top of the Firefox window) and select {menu Troubleshooting Information}. #:[[Image:Troubleshooting info - win]] #Click the {button Reset Firefox} button in the upper-right corner of the Troubleshooting Information page. #:[[Image:Reset Firefox - Win - 1]] #To continue, click {button Reset Firefox} in the confirmation window that opens. #Firefox will close and be reset. When it's done, a window will list the information that was imported. Click {button Finish} and Firefox will open. That's it – you're done! {/for} {for mac} #On the menu bar, click the {menu Help} menu and select {menu Troubleshooting Information}.<br><br> #:[[Image:Troubleshooting info - mac]] #Click the {button Reset Firefox} button in the upper-right corner of the Troubleshooting Information page. #:[[Image:Reset Firefox - Mac - 1]] #To continue, click {button Reset Firefox} in the confirmation sheet that slides down. #Firefox will close and be reset. When it's done, a window will list the information that was imported. Click {button Done} and Firefox will open. That's it – you're done! {/for} {for linux} #At the top of the Firefox window, click the {menu Help} menu and select {menu Troubleshooting Information}. #:[[Image:Troubleshooting info - lin]] #Click the {button Reset Firefox} button in the upper-right corner of the Troubleshooting Information page. #:[[Image:Reset Firefox - Lin - 1]] #To continue, click {button Reset Firefox} in the confirmation window that opens. #Firefox will close and be reset. When it's done, a window will list the information that was imported. Click {button Finish} and Firefox will open. That's it – you're done! {/for} You could try running speedyfox (crystalidea.com/speedyfox) first - this optimises your appdata default files and does not need to be installed. Run it two or three times in succession and, in my experience Firefox will load more quickly and reduce memory usage afterwards.