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Thunderbird Portable and FireFox Browser keep crashing, only work when I am in Windows Safe Mode

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Every time I click on an email to open and read in Thunderbird Portable or when I open a new tab or link in Firefox, the programs crash. I tried changing my scanning settings on Avast as one thread suggested, but that didn't help. So I tried booting up in Safe Mode with Networking as another thread suggested and Thunderbird and FireFox now work perfectly. How do I get these applications to begin working again outside of Safe Mode?

Every time I click on an email to open and read in Thunderbird Portable or when I open a new tab or link in Firefox, the programs crash. I tried changing my scanning settings on Avast as one thread suggested, but that didn't help. So I tried booting up in Safe Mode with Networking as another thread suggested and Thunderbird and FireFox now work perfectly. How do I get these applications to begin working again outside of Safe Mode?

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sfhowes said

Besides disabling Avast in the Main Settings of the Mail Shield, did you disable the SSL scanning component? There are quite a few steps to completely disable Avast interference in email: https://help.avast.com/en/av_free/17/settings_sh_mail_basic.html

Hi sfhowes, Yes I did disable the SSL scanning component. No change. The crashes seem to happen when loading the emails that have more content than just text. I have the option to block remote content, but the messages that have images seem to be the most problematic.