Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions and some Preferences.

• Open websites will not be saved in Firefox versions lower than 25.

To Reset Firefox do the following:

For Firefox versions previous to 29.0:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

For Firefox 29.0 and above:

1. Click the menu button , click help and select Troubleshooting Information.

Now, a new tab containing your troubleshooting information should open.

1. At the top right corner of the page, you should see a button that says "Reset Firefox". Click on it.
2. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
3. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Regrettably the problem remains with 29. The reset process hangs with the following being displayed:

Well, this is embarrassing.

Firefox is having trouble recovering your windows and tabs. <more text. </p>

You can check for problems with preferences.

Delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences

Note that a reset will try to recover some of your personal data and can possibly carry over some issues.

You can try to create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I'm sorry, but I have no idea what is going on. I can't find the file I'm supposed to find. There needs to be an easier way. Would uninstall, restart, re-install a fresh copy of version 29 work? Do I also need to save my bookmarks so I don't have to recreate them?

You can try to create a new profile or reset Firefox.

• https://support.mozilla.org/kb/Managing+profiles
• https://support.mozilla.org/kb/reset-firefox-easily-fix-most-problems

When you reset Firefox then a new profile is created and some personal data (bookmarks, history, cookies, passwords, form data) is automatically imported and the current profile folder will be moved to the desktop to an "Old Firefox Data" folder. Installed extensions and other customizations (toolbars, prefs) that you have made are lost and need to be redone.

It is possible to recover more data from the old profile, but be cautious not to copy corrupted files to avoid carrying over the problem

• https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I created a new profile, and checked to see that it is the one to use. The black page display now last longer before changing to the white page. Same extensions were automatically loaded in. I manually installed my old extensions. (Now, I notice that newer version of FireFox do not show the extensions one has installed. Luckily, I had a printed list of extensions.)

It will be interesting to see if this new profile solves the frequent and often crashes I have with Win-7 64-bit; but do not experience with my Win-7 32-bit machine with same add-ons/extensions.