Hey Vivaldin,

Have you tried starting Firefox in Safe Mode? Hold down "shift" while Firefox is starting up. If the crash doesn't happen in Safe Mode, you should read Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

There is also a lot of useful stuff in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) Knowledge Base article. If you've recently upgraded, you might want to check out this article as well.

Hopefully this helps!

I've Tried safe mode, the checkbox window crashes immediately after appearance.

You could post a couple more crash ID s see if they lead to any useful info, and whether you get the same crash signature each time or not. Unexplained crashes sometimes turn out to have been caused by malware, it may be worth trying to rule that out as a cause.

Crash info

• Crash ID report 3a149396-b4c3-4667-86c7-f96fc2120201
• Crash signature: _PR_MD_PR_POLL
• associated bug: Bug 612270 <-- but it is an old one

You may wish to consider installing Firefox Portable in the meantime, as an additional browser; you could use firefox 3.6 that way. It may run without crashing, and could be persuaded to use your existing bookmarks.

• see http://portableapps.com/news/2012-02-01_-_firefox_portable_3.6.26_released
• is my firefox problem a result of malware
• and the tips in /questions/914980

Crash ID: bp-3a149396-b4c3-4667-86c7-f96fc2120201 01.02.2012

Crash ID: bp-4f5fc5bd-34eb-4eae-97ef-b4fa12120202 02.02.2012

Crash ID: bp-b4d183d1-3620-4ac3-a276-970e02120203 03.02.2012

Almost always Firefox crushes on a startup, and crush window does not appear, just a standart windows crush report. But sometimes it starts normally, but crushes when i try to do something in it, and then the crush window appears. So, not much of crushlogs)

I am not actually getting any info about those crash ID s yet, I will try again later. (Still no results, I note in another thread the-edmeister mentioned he had also noticed some problems getting crash-stats info)

Tried using portable Firefox, after couple hours of run it started to crush as well)) Not so often though...

Which security software (firewall, anti-virus) do you have?

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/kb/Server+not+found
• https://support.mozilla.org/kb/Firewalls

Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
• http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

You appear to have solved the problem. Would you like to share the information with others, was it a problem with

• malware ?
• or security software ?

I am sure others may find the information helpful.

Sorry for the interruption, was busy. Ive cleaned all the rules for Firefox from the firewall, and i aint using any antiviruses. All that had no effect. Also ive fullchecked my computer with half of the malware programs from the list above. Found couple minor viruses, deleting which hasnt had any effect to the Firefox performance. Gonna continue with other programs left in short time, this checking takes a lot of time.