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by runaway 5554 days ago
I made a similar Chrome plugin called GIF Scrubber: https://chrome.google.com/webstore/detail/gbdacbnhlfdlllckel...

It also uses a canvas element to render each frame but it does support weird disposal methods. You can see the (very sloppy) source by just viewing the source of the plugin window.

You mentioned getting test images for the disposal methods and I found these to be very helpful: http://algif.sourceforge.net/#18

I'd also recommend using some kind of movie player-style control like I used and some kind of "explode" function. They both proved popular.