Firefox nonresponsive on a Ubuntu 24.04 VM

Hello. I'm running a few VMs to test some software between them. I'm trying to launch a server page on Firefox to test if it started up correctly, but Firefox does nothing when launched. I can type into the address bar, and I can hit the tab closing button to clear the window, but none of the other buttons do anything, and hitting 'enter' doesn't cause Firefox to search for the address.

What I've tried, before throwing up my hands and deciding to either give up or seek help: un/reinstalling Firefox, pausing/stopping/closing other open VMs, stopping this VM and giving it more cores and RAM. No change. Firefox remains, staring, unblinking, uncaring.

Easily could be something simple I'm missing - I work in computing, but only begrugingly