Affected versions

• Firefox 67.0b3 (20190318154932)
• Firefox 68.0a1 (20190319215514)

Affected platforms

• macOS 10.14

Steps to reproduce

1. Open Firefox and open at least 2 tabs.
2. Drag&Drop any tab in the tab strip to change its position.
3. Observe the other tabs.

Expected result

• All other tabs looks the same.

Actual result

• One of the other tabs has a hovered state.

Regression range

• I will search for a regression range ASAP.

Additional Notes

• Attached screen recording.
• If the mouse is moved after releasing the tab the hovered state is dismissed.
• The issue is also reproducible on pinned tabs.

Hello, here is the regression range:

Last good revision: 964b118ac852 (2012-01-13)
First bad revision: 3eaa7d9f1c69 (2012-01-14)
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=964b118ac852&tochange=3eaa7d9f1c69

(In reply to Alexandru Trif from comment #1)

Hello, here is the regression range:

Last good revision: 964b118ac852 (2012-01-13)
First bad revision: 3eaa7d9f1c69 (2012-01-14)
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=964b118ac852&tochange=3eaa7d9f1c69

Regressed by bug 716793 perhaps? Otherwise I don't see anything that seems remotely related.

Regressed by bug 716793 perhaps?

Could be, in theory.... It's been a while since then and a bunch of things changed, both in Gecko and the front end.