@librewolf I didn't see anything related after a quick search but I wasn't the only one, apparently:
:fediverse: https://snac.daltux.net/daltux/p/1746276891.177753
Another thing that affected me with the latest update is LibreWolf identifying itself as LibreWolf via user-agent and breaking sites or them showing the basic HTML version.
But for this issue was already reported: