Having problems with web player

I wasn’t able to fit this question in any of the existing categories, so I posted in this one; hope it’s not wrong

I just tried the web player at https://web.libretro.com using Firefox, and was not able to use it at all.

First, several cores such as the Nintendo 64 ones never load: the “loading” circle in the Run button stays like that forever. Second, I tried the PrBoom core, which curiously did load, but when trying to load content (by browsing for WAD files) it actually does absolutely nothing. Again click on add content, browse, and just nothing.

Could someone help please? Thanks.

I have the same issue on Chrome on a Chromebook running ChromeOS 114.