Firefox segfaults on Plasma while browsing for files

Hi. I've set up LFS and most things seem to work as intended. I have this issue with Firefox though, where every time I try to open a file browser, it just crashes. Trying to upload images for example, firefox will just close as soon as I click the browse button, and journalctl will show "core dumped". Interestingly it seems to work as intended on Xfce, so I'm not quite sure what would cause this on Plasma considering I'm fairly sure all the dependencies are installed.

Does anyone have any idea if there's a certain dependency that could cause this issue? I've already tried removing the .mozilla folder as a test and it remains the same. It's Firefox-78.0.1, and I'm using KDE Frameworks 5.70, along with Plasma 5.18.5.