Gah-Your-tab-just-crashed https://support.mozilla.org/en-US/kb/firefox-crashes-troubleshoot-prevent-and-get-help

We have recently seen multiple reports that Bitdefender is causing issues with tab crashes in Firefox 73. If you use Bitdefender and suffer from this issue then try to uninstall this software (you may also have to uninstall Bitdefender Agent).

• /questions/1280327 Firefox 73.0.1 was working fine, suddenly all new tabs "tab crash".

You can possibly contact Bitdefender for support.

Cheers guys, thanks for your help. cor-el, that was it! I'll shoot Bitdefender a message.

All passwords and favourites gone though... Ouch!

Thanks again!!

It looks that Bitdefender has pushed an update to address this issue. See comment 2.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1616993#c2

Issue was apparently on us and was affecting users of Bitdefender AV free. We pushed an update about 2 hours ago with the fix. You should see a drop in crashes as update propagates across market.