Firefox on iPhone as well. Mine brings out the file picker. I copied a TTF font to iCloud Drive and could pick it on the iPhone.

Firefox 108.1 from the App Store, iOS version 16.2.

In safari on iPhone, it brings up the weird iPhone document browser thingy when I hit the button. Does Firefox have access to that, on iOS?

> weird iPhone document browser thingy

It’s a “Choose File” dialog, like from the “Browse” button of a file input. :)