Computers are so fucking weird. Every day there's some new thing. Chromium on Linux (Fedora 43) is in some kind of sandbox, so I can't open local files, but only some of them? All of the directories that were created by the desktop (Documents, Downloads, Music, Videos, Pictures, etc.) are accessible, as well as a few hidden directories (.local, .nv, .pki, .var), but nothing else is. I can't even type it in explicitly and fully, it's a 404.
Firefox _can_ reach all files my user has access to.