Reset Firefox – easily fix most problems

Over time Firefox can develop problems like slowness, crashing, unwanted toolbars and more. 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. Table of Contents

   What does the reset feature do?
   How do I reset Firefox to its default state?

What does the reset feature do?

All of your Firefox settings and personal information are stored in your profile folder. The reset feature works by creating a new profile folder for you while saving your most important data.

Firefox will try to keep the following data:

   Bookmarks
   Browsing history
   Passwords
   Cookies
   Web form auto-fill information
   Personal dictionary 

The following items and settings will be restored or removed:

   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 Where can I find my bookmarks? and Awesome Bar - Find your bookmarks, history and tabs when you type in the address bar for more info. Also, since your 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, 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 Firefox Services, including Facebook Messenger for Firefox will be removed. 

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 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. How do I reset Firefox to its default state?

   At the top of the Firefox window, click the Firefox button, go over to the Help sub-menu
   and select Troubleshooting Information.

       Troubleshooting info - win 

   Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.

       Reset Firefox - Win - 1 

   To continue, click 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 Finish and Firefox will open. 

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I'm using a nexus 7 tablet. Where do I find the firefox button?

I've been told this can't be done on an android tablet. I've done the settings>clear data thing and it hasn't cured the problem.

It sounds like the sites you're visiting are doing something strange: unless you typed a different password to the one that's stored in Password Manager, Firefox won't prompt you to update anything.

How are you getting the passwords into Firefox — via Sync, or via saving them on the web the first time you enter them?

When you enter a password for the first time, does it work (and offer to save)?