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Slowness, crashing, unwanted toolbars, search hijacking and more can be fixed by restoring Firefox to default settings. We'll save your bookmarks and passwords.

Over time Firefox can develop problems like slowness, crashing, unwanted toolbars and more. [[Troubleshoot and diagnose Firefox problems|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 are stored in your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|profile folder]]. The reset feature works by creating a new profile folder for you while saving your most important data. '''Firefox will keep the following data:''' {for not fx23} *Bookmarks *Browsing history *Passwords *Cookies *Web form auto-fill information {/for} {for =fx23,=fx24} *Bookmarks *Browsing history *Passwords *Cookies *Web form auto-fill information *Personal dictionary {/for} {for fx25} *Bookmarks *Browsing history *Passwords *Open windows and tabs *Cookies *Web form auto-fill information *Personal dictionary {/for} '''The following items and settings will be restored or removed''': {for not fx18} *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Find and install add-ons to add features to Firefox]] 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 to use bookmarks to save and organize your favorite websites#w_where-can-i-find-my-bookmarks|Where can I find my bookmarks?]] and [[Search your bookmarks, history and tabs with the Awesome Bar]] for more info. Also, since your [[Cookies - Information that websites store on your computer|cookies]] are saved, you shouldn't be logged out of any websites you were logged in to 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 - Where Firefox stores your bookmarks, passwords and other user data]] article for more information about these. {/for} {for =fx18,=fx19,=fx20} *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Find and install add-ons to add features to Firefox]] 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 to use bookmarks to save and organize your favorite websites#w_where-can-i-find-my-bookmarks|Where can I find my bookmarks?]] and [[Search your bookmarks, history and tabs with the Awesome Bar]] for more info. Also, since your [[Cookies - Information that websites store on your computer|cookies]] are saved, you shouldn't be logged out of any websites you were logged in to 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 - Where Firefox stores your bookmarks, passwords and other user data]] article for more information about these. *[[How does Facebook Messenger for Firefox work?|Facebook Messenger for Firefox]] will be removed.<!-- ADDITION FOR FX18 - 20 --> {/for} {for =fx21,=fx22} *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Find and install add-ons to add features to Firefox]] 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 to use bookmarks to save and organize your favorite websites#w_where-can-i-find-my-bookmarks|Where can I find my bookmarks?]] and [[Search your bookmarks, history and tabs with the Awesome Bar]] for more info. Also, since your [[Cookies - Information that websites store on your computer|cookies]] are saved, you shouldn't be logged out of any websites you were logged in to 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 - Where Firefox stores your bookmarks, passwords and other user data]] article for more information about these. *All [[Use Firefox Services to add social features to your browser|Firefox Services]], including [[How does Facebook Messenger for Firefox work?|Facebook Messenger for Firefox]] will be removed. <!-- NEW VERSION OF THIS ITEM FOR FX21 & 22 --> {/for} {for =fx23,=fx24} *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Find and install add-ons to add features to Firefox]] 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 to use bookmarks to save and organize your favorite websites#w_where-can-i-find-my-bookmarks|Where can I find my bookmarks?]] and [[Search your bookmarks, history and tabs with the Awesome Bar]] for more info. Also, since your [[Cookies - Information that websites store on your computer|cookies]] are saved, you shouldn't be logged out of any websites you were logged in to before the reset. *Site-specific preferences, search engines, <!-- REMOVED 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 - Where Firefox stores your bookmarks, passwords and other user data]] article for more information about these. *All [[Use Firefox Services to add social features to your browser|Firefox Services]], including [[How does Facebook Messenger for Firefox work?|Facebook Messenger for Firefox]] will be removed. {/for} {for fx25} *Extensions and themes: Although they can be incredibly helpful, some extensions and themes can cause problems. If you need to reinstall important extensions, see [[Find and install add-ons to add features to Firefox]] for help. *Site-specific preferences, search engines, 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 - Where Firefox stores your bookmarks, passwords and other user data]] article for more information about these. *All [[Use Firefox Services to add social features to your browser|Firefox Services]], including [[How does Facebook Messenger for Firefox work?|Facebook Messenger for Firefox]] will be removed. {/for} {for fx15} {note}'''Note:''' After the reset is finished, your old Firefox profile information will be placed on your desktop in a folder named "Old Firefox Data." If the reset didn't fix your problem you can restore some of the information not saved by copying files to the new profile that was created. See [[Recovering important data from an old profile#w_copying-files-between-profile-folders|Copying files between profile folders]] for instructions. If you don't need this folder any longer, you should delete it as it contains sensitive information.{/note} {/for} =How do I reset Firefox to its default state?= [[T:resetsteps]] [[Template:ShareArticle|link=http://mzl.la/MnSTZB]]