Original CFDG: https://www.contextfreeart.org/gallery2/index.html#design/618
The patterns are nice, however, when I click the back browser button (in Firefox), your pen thinks that I clicked for a "new pattern." The load of the pattern is also slow to respond to my click. Is the slowness my browser, or your Pen? Not sure, but I thought you might like to check this out for yourself.
@wilkens-stem Nancy, thanks for the heads up. The globalCompositeOperation = 'screen' I was using is extreeeeeeeeemely slow on Firefox... Things should work better now...
Need to know how to enable it? Go here.