What is the startup setting?
- Tools > Options > General > Startup: When Firefox Starts:
You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and delete a possible user.js file to reset all prefs to the default values.
Start Firefox in Safe Mode 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 or otherwise make changes.
What is the startup setting?
*Tools > Options > General > Startup: When Firefox Starts:
You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
* http://kb.mozillazine.org/browser.sessionstore.resume_session_once
You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and delete a possible user.js file to reset all prefs to the default values.
*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 or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes