Wow that was something I wasn't expecting. Well I guess it does kinda make sense that running untrusted code on a gpu wouldn't be the best idea, however I seriously thought that browsers just passed their glsl directly to the GPU. Also since linux doesn't have its own graphics API I am afraid that WebGL support would introduce a lot of complexity, since you can definitely pass via OpenGL but Vulkan could be also an option.

Thank you for the tip!