What’s your screen resolution? The only way I can get firefox to run even remotely acceptably on a 4k screen is via offloading the qube’s graphics onto a discrete GPU (in my case nvidia as well). See Seamless GPU passthrough on Qubes OS with VirtualGL. There’s a long-term fix in the works (Xen Project Summit 2024 VODs are available on YouTube), but it doesn’t look like it will be ready anytime soon.
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