591829 - Opening new tab after hovering over "Move to group" makes tabs disappear

Status: RESOLVED DUPLICATE of bug 587990

(Firefox Graveyard :: Panorama, defect)

Description

[Dennis Jacobfeuerborn]

User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.4) Gecko/20100624 Remi/fc11 Firefox/3.6.4
Build Identifier: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b5pre) Gecko/20100829 Firefox/4.0b5pre

If right-click on a tab and then move the mouse over "Move to group" and then open a new tab all the tabs that where open except the last one disappear.
If you close that last tab the previous one reappears and this continues to happen until you reach the last tab.

Reproducible: Always

Steps to Reproduce:
1. Open a few tabs
2. Right-click a tab and hover over at least once over "Move to group" (no need to click)
3. Now open a new tab
Actual Results:  
Tabs disappear

Expected Results:  
Nothing should happen to the tabs

This happens only once i.e. If you trigger this bug close all the tabs then open a few new ones and try to trigger the problem again this bug will not show up again. A restart of Firefox is necessary to be able to retrigger it.