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Why does Firefox open tabs and crashes even if no malware is found?

  • 6 replies
  • 2 have this problem
  • Last reply by matt2016

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Dear all,

The problem: I am accessing a webmail server (Outlook) located at a British university. Either when I log in or log out there, Firefox stops responding. I have to close the window and then restore the session to get my tabs back (which has led me to open very few tabs these days).

The diagnosis: I thought it might be malware, especially because sometimes tabs opened with the name "prosperent", but were not fully loaded. I think whenever I used CCleaner just before logging in, the log in was smooth.

Attempted fixes: - First of all, I reset Firefox internally - to no avail. - Next, I uninstalled and reinstalled Firefox, but the settings were remembered for some reason. So I uninstalled again, deleted all personal Firefox setting folders and reinstalled it again. Firefox was now pure in start mode - the problem persisted. - Then, I installed a malware programme to check for hidden viruses in addition to my normal anti-virus programme. The malware programme found a few cookies and deleted - the problem persisted.

I would be happy to know what else you might recommend here.

Best wishes, Matt

Chosen solution

Did you solve the problem ? Just noticed you did not get a response to your last replay.

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All Replies (6)

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Does this happen only with that site, or others also?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

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Received vai PM matt2016 said

Hi Fred, Thank you so much! It looks as though your advice did the trick while I had too quickly moved to more ballistic options. I thought that "refresh" was the right choice before, but clearly was not. Sorry I should have maybe read more closely about that option. I will see whether the prosperent tabs still open, which would be an indicator for more trouble. Best wishes, Matt
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Refresh Firefox {web link} is a LAST RESORT ! !

Refresh Firefox - reset add-ons and settings

If you're having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.

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I did that early on before uninstalling, reinstalling and starting in safe mode. This is what I meant by "reset Firefox internally".

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Chosen Solution

Did you solve the problem ? Just noticed you did not get a response to your last replay.

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Dear John,

Very kind of you to check back. No, but the problem just disappeared. I am not sure which of my actions, if any, caused it to disappear.

Anyway, thanks for all the suggestions here.

Best, Matt