Running firefox on aarch64 here right now (Ubuntu 26.04 ARM on snapdragon X1E)

did you enable the about:config option? it may be required

Yes, you don’t get that far without it.

	▲	rlmineing_dead 3 hours ago \| parent [-]
		What's your GPU driver? There's a good chance this is a bug with the GPU passthrough. You can fall back to software rendering in the advanced options while it's starting if you want to try