User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0 Steps to reproduce: Trying to address "This bug is not related with 32-bit vs. 64-bit. I can reproduce the issue if I install both Thunderbird 52 and 60 side by side. Apparently Thunderbird 52 will write registry keys under HKCU\Software\Classes, but Thunderbird 60 will not." from https://bugzilla.mozilla.org/show_bug.cgi?id=1509918#c30 "emk's observation in comment 30 looks interesting; indeed, correcting the registry keys will stop the prompts with TB x64 on a system where a 32bit release was there before - though only a clean install of 32bit TB 60 can rule out such a regression from 52." in order to move along 64 bit.
Bug 1572266 Comment 0 Edit History
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User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0 Steps to reproduce: Trying to address "This bug is not related with 32-bit vs. 64-bit. I can reproduce the issue if I install both Thunderbird 52 and 60 side by side. Apparently Thunderbird 52 will write registry keys under HKCU\Software\Classes, but Thunderbird 60 will not." from bug 1509918 comment 30 "emk's observation in comment 30 looks interesting; indeed, correcting the registry keys will stop the prompts with TB x64 on a system where a 32bit release was there before - though only a clean install of 32bit TB 60 can rule out such a regression from 52." in order to move along 64 bit.