I first noticed this on https://hg.mozilla.org/mozilla-central/rev/9bcc52594322. All my tab previews are black (instead of some old cached preview): https://people.mozilla.org/~bhearsum/sattap/80669652.png
Status: NEW → RESOLVED
Last Resolved: 4 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 961479
Product: Firefox → Firefox Graveyard
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