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CanvasBlocker causes Firefox to allocate endless memory / memory leak when visiting leetcode.com #780

@piperun

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@piperun

Unfortunately it doesn't always happen, but at times when you go to leetcode.com Firefox will warn "CanvasBlocker is slowing down this page" and suddenly the web browser becomes extremely unresponsive and you can see Firefox start allocating ram and using a lot of CPU power.

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