Not OP, but live in an apartment, we don’t have any place for outgoing mail, so I need to write in on the envelopes and drop them in a random mailbox?

That’s actually much smaller than I expected.

I think he was trying to demonstrate for new users that it would redirect them to use the appropriate installer instead of relying on .exe files?

I think the Firefox thing might actually be KDE restoring your session and not Firefox. Try to check KDE settings to see if you can start with a blank session on login.