I believe this bug will be covered from [another fix](https://bugzilla.mozilla.org/show_bug.cgi?id=1848605) that improves the method of loading favicons for Top Sites
Bug 1829455 Comment 4 Edit History
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I am still unable to reproduce. I believe this bug will be covered from [another fix](https://bugzilla.mozilla.org/show_bug.cgi?id=1848605) that improves the method of loading favicons for Top Sites