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Firefox windows browser lagging all websites while scrolling

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I was enjoying using firefox. It has only been 2 days since installation after which it started lagging. It lags only while scrolling pdfs, youtube. All other animations are working fine. Only problem is in scrolling it.

I was enjoying using firefox. It has only been 2 days since installation after which it started lagging. It lags only while scrolling pdfs, youtube. All other animations are working fine. Only problem is in scrolling it.

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