Unwatch icon is not visible on monobook. Place where it should be can be clicked and works but I can't see blue star indicating I watch particular topic.
Checked in betalabs:
In FF 53, there is a strange issue with the star icon twinkles when a cursor hovers over it. The issue is very minor - filed as T164519: [minor] monobook: FF only - the star icon twinkles when hovered over
QA Recommendation: Resolve