I just tested this on a PC and could not get it to misbehave, so it must be a Mac only bug. Therefor, I am switching the Component to "OS Integration".
Component: General → OS Integration
QA Contact: general → os.integration
Component: OS Integration → DOM: Events
Product: Firefox → Core
QA Contact: os.integration → events
Seems to be fixed with b3.
Status: NEW → RESOLVED
Last Resolved: 10 years ago
Resolution: --- → FIXED
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