From https://www.reddit.com/r/firefox/comments/omzmxn/annoying_white_blocks_after_minimizing_firefox/ >There are 3 of them, as I mouse over, they disappear. Does not seem to happen on all web pages, for example this happens on YouTube and Reddit, while Discord and Discogs is unaffected.
Bug 1721100 Comment 0 Edit History
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From https://www.reddit.com/r/firefox/comments/omzmxn/annoying_white_blocks_after_minimizing_firefox/ >There are 3 of them, as I mouse over, they disappear. Does not seem to happen on all web pages, for example this happens on YouTube and Reddit, while Discord and Discogs is unaffected. User worked around the issue by switching their GPU to Nvidia.