When I click on Tools, Options, the screen freezes

No matter what website I am on, when I click on Tools, and then click on Options, Firefox freezes. I cannot refresh, I cannot close the tab, I cannot close the browser session. The session does not close when I click on the Firefox icon in the start tray and click on Close Window. The only way to get the web browser to close is to Ctrl+Alt+Del and end the task (which always shows that it is "Running"). I have waited as long as 5 minutes for the browser to Refresh or Close, and nothing happens.

You can check for problems with preferences.
Delete possible user.js 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
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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