CanvasBlocker
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Possible memory leak
On certain websites when this extension is enabled, firefox uses 100% CPU and slowly but surely consumes all RAM and even crashes the kernel apparently, unlucky. I can reliable get this to occur in Scribblio with Canvas API set to 'readout'. Any other combination of options in CanvasBlocker is fine. Whenever something is actively being drawn on screen the usage maxes out.
Generally, the Canvas API protection should be disabled for browser games like the one you mentioned, since it serves no purpose there. Maybe there is something wrong in particular with using CB on this site, but that's a question for our extension developer.