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Black thumbnails pages previews by Ctrl + Tab

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Donald
Donald
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When I use shortcut control + Tab with Firefox 79.0 (64-bit) (MacOS Catalina Version 10.15.6 (19G73)) i to often see blank page miniatures but not real page thumbnails. Looks like Firefox made page snapshots not so often or correct.

When I use shortcut '''control + Tab''' with Firefox 79.0 (64-bit) (MacOS Catalina Version 10.15.6 (19G73)) i to often see blank page miniatures but not real page thumbnails. Looks like Firefox made page snapshots not so often or correct.
Attached screenshots