Hello,
Vista is my OS.
Firefox is current. No spyware malware or virus found.
Hardware accelerator is unchecked.
All plug ins are current.
All extensions are current.
When I have more that one window or tab of Firefox opened it crashes or does not respond at random times.
Firefox crashes or does not respond at least once daily or every other day.
I have completed all the steps this lists. https://support.mozilla.org/en-US/k...
What can I do to prevent Firefox from crashing or not responding.
Thanks for your time and help.

Thank you very much for providing me with those details. Regarding your issue with the Firefox browser, please proceed with the following steps in order to assist you in resolving this issue:

1.) Go to the 'Start' button on your desktop & locate the 'Control Panel'.
2.) Locate the 'Programs' option to add/remove installed programs.
3.) Find Firefox in the programs list and choose the 'Uninstall' option.
4.) Once you've uninstalled the program, reboot your computer.
5.) In the 'Start' menu, search for 'Windows Update'.

When you have confirmed that your Windows is up to date, please proceed to clicking the following link to download the latest version of Firefox Download Firefox (http://www.mozilla.org/firefox/new/#download-fx)

If you the issue persists, please let me know and I'll provide further steps to resolve the issue.

Windows is up to date.
Do you think uninstalling and reinstalling would solve the issue?