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DESCRIPTION
Some people might be experiencing issues due to update to YouTube UI - but worry not, the fix is already out and awaiting review by Google\Mozilla.
The review usually takes ~24 hours, so as soon as you see that the version 3.0.0.9 is out - everything should be fine.
UPD:
3.0.0.9 is out in Chrome store, yay. Mozilla are taking their time, though.