Hello there, try to re install firefox maybe it will fix the error i hope so....

That did it....thanks sahilnmmt

Hi lwood , thanks for choosing mozilla Firefox ....if you have any further qurries please let us know .....we always help you in our best.

Note that your System Details List shows a lot of browser.sessionstore.* that didn't had the default value and that you also had a user.js file that automatically initializes some prefs on each Firefox start.

1. browser.sessionstore.max_tabs_undo: 0
2. browser.sessionstore.max_windows_undo: 0
3. browser.sessionstore.restore_on_demand: False
4. browser.sessionstore.resume_from_crash: False
5. browser.sessionstore.resume_session_once: False

See also:

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

So if it happens again then keep an eye on your prefs.

• http://kb.mozillazine.org/about:config

I thought it worked after re-install, but not when I shut down the laptop; I don't get the config stuff, not my bag....really too bad as I've used this browser darn near it's inception and have never had an issue like this.

Nothing is forever I guess, now to fight my way through learning a new one

Thanks for the help

The about:config is not too difficult once you get used to it and in your case you may only have to check the sessionstore prefs.
So you can open the about:config page via the location bar and paste sessionstore in the search bar at the top of this page.

You can attach a screenshot of this filtered list then we can see if the prefs have their default value and not user set (bold).

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

Thanks for trying to help, one of these versions will eventually allow me to save all the tabs when I shut down the PC, until them I'm stuck with Chrome.

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

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 some files from an existing 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