417964 - Navigation Bar loses Navigation Arrows randomly with new instances of Firefox

Status: RESOLVED DUPLICATE of bug 417421

(Firefox :: Theme, defect)

Description

[Ben Ritter]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b3) Gecko/2008020514 Firefox/3.0b3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b3) Gecko/2008020514 Firefox/3.0b3

See provided URL for a visual.  At startup, Firefox sometimes loses the Navigation Arrows in the Navigation Bar.  I have run tests and have concluded no other buttons in the Nav Bar are ever dropped, nor is there any correlation between the times this happens and my web or system activity.

Reproducible: Sometimes

Steps to Reproduce:
1.  Begin a new instance of Firefox.
Actual Results:  
About 50 percent of the time, Navigation Arrows are dropped from the Navigation Bar.

Expected Results:  
Firefox should have maintained all Navigation Bar entries.  It mostly succeeds.

This bug occurs with the default packaged theme.  I have no other themes installed on this system.

Comment 1

[Ria Klaassen (not reading all bugmail)]

When I remove the Back Forward button and add it again in a trunk build, they will not show up when I run a branch build. That's all I can reproduce at the moment (WinXP).
Dupe of / related to Bug 417890 ?

Comment 3

[Bryan Henry]

* Comment carried over from bug 418395
>Dupe of 417964, but this is definitely confirmed. I think it has something to
>do with the fact that the back/forward buttons where combined in 3.0b3 and are
>still separate entities in 2.0.0.* builds. Please carry any discussion over to
>the other bug.

Comment 4

[Bryan Henry]

And, would you look at that, this is a dupe too! Imagine that.