With a new profile, Thunderbird 102.7.0 in OpenMandriva Linux versions 23.90 and 23.01. I also tried the 102.7.2 tar.bz2 version from Thunderbird website with same results. I find that I need to use different browsers for different purposes. The setting in Settings>Files and Attachments>https I set to Always ask. Every time I click on a link Thunderbird opens the link with what ever browser is set as the default in KDE Plasma SystemSettings>Applications>Default Applications. The setting in Thunderbird Settings>Files and Attachments>https is rewritten to that browser. This does not seem correct. I have tried this with network.protocol-handler.warn-external.https set to true and false and that seems to have no affect. That having no affect seems odd. So it appears something is causing the settings in Thunderbird to be overridden by settings in KDE Plasma desktop. Not what I need. If I use an old profile this works as expected. Not sure how old that profile is but maybe v. 99 or 100. I do not know if this is for sure Thunderbird not respecting it's own settings or something else. But I have done this "Always ask" thing with browsers for years.