https://bugs.winehq.org/show_bug.cgi?id=54259
--- Comment #2 from Jürgen Luers juergen@luers-net.de --- I fully uninstalled and reinstalled Firefox. I also retested it on a different user. The problem still exists. Please check, if winehq website really has no problem.
When hoovering over the problematic link, it displays to be "https://dl.winehq.org/wine/source/8.0/wine-8.0-rc2.tar.xz", but in real it is pointing to "//dl.winehq.org/wine/source/8.0/wine-8.0-rc2.tar.xz" (I have inspected the link object with Firefox debugger).
md5sum of wine-8.0-rc2.tar.xz downloaded from https://www.winehq.org/news/ (i.e. the bad one) is d41d8cd98f00b204e9800998ecf8427e.
md5sum of https://dl.winehq.org/wine/source/8.0/wine-8.0-rc2.tar.xz (i.e. the good one) is 5a265fcfac8f93fde4f096e8508423cd.