Why Firefox fails WebGL test?

[accetto]

I've found, that the Firefox in the containers from the project accetto/ubuntu-vnc-xfce-g3 fails the WebGL test https://get.webgl.org. Why is that?

[accetto]

This is actually not a bug, but a compromise decision taken during development. I try to keep the images slim and therefore I try to include only a minimum of necessary packages.

However, Firefox requires the mesa-utils package to be installed to pass the WebGL test from above. Interestingly enough, Chromium doesn't require that.

Because the mesa-utils package adds 143MB to the image, which is almost a half of the base image accetto/ubuntu-vnc-xfce-g3:vnc size, I've decided against it.

There are several ways to get a Firefox image, which passes the WebGL test, if you really need it:

1. You can install the mesa-utils package in the runtime using sudo apt-get update && sudo apt-get install -y mesa-utils.

2. You can modify the Dockerfile and built a new image locally.

3. You can use one of the Firefox images from the Docker Hub repository accetto/ubuntu-vnc-xfce-opengl-g3, because the images from the project accetto/headless-drawing-g3 already include support for OpenGL/WebGL/VirtualGL.

4. You can use one of the bigger Firefox images of the Generation 2 (accetto/xubuntu-vnc-novnc-firefox) or Generation 1 (accetto/ubuntu-vnc-xfce-firefox-default, accetto/ubuntu-vnc-xfce-firefox-plus).