It doesn't work in Firefox 69.0 :/ Am I the only one? I select one of the images provided in the webpage and it gets stuck on "Loading image...". Sigh...
<SetDimensions>: Failed to create WebGL context: WebGL creation failed: * Refused to create native OpenGL context because of blacklist entry: FEATURE_FAILURE_GLXTEST_FAILED * Exhausted GL driver options.
This is my work laptop so I never bothered to setup Mesa/GL correctly .. probably the issue. The app should still do a check and report that WebGL isn't enable to the user.