Okay, I don't know what changed on my system since yesterday, but when I tested it again today using 91.1.0 from Fedora on Fedora 34 the PDF attachment in the composition window opened in my default Firefox Nightly application.
You want it to use the built-in PDF viewer. I'm not sure whether this is a defect or an enhancement request, but I'll confirm it. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1945741 Title: [upstream] PDF attachment opens in Firefox instead of the built-in viewer when opened from the compose window To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1945741/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
