Could you attach a minimal testcase (.html), please.
Component: DOM: CSS Object Model → Event Handling
Created attachment 692858 [details] Test page reconstructing the bug. The bug does reoccur on my system with this test page.
Per policy at https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Inactive_Bugs. If this bug is not an enhancement request or a bug not present in a supported release of Firefox, then it may be reopened.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 4 days ago
Resolution: --- → INACTIVE
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