800929 - Double-clicking tab overflow navigation arrows stops working after some period of time (and begins scrolling only one tab at a time)

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[ben]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1
Build ID: 20120905151427

Steps to reproduce:

There is some event that causes the normal tab overflow navigation's double-click functionality to stop working. I don't know if it's a time-based event, a memory-based event, or the sheer number of tabs that are open. Unfortunately, I'm unable to isolate the cause, but this issue occurs, predictably, after a few days of heavy Firefox use (without closing the browser).

If I restart Firefox -- and even if I restore my previous session after restarting -- the issue is resolved and the buttons work normally and as expected. That is, until a couple/few days later, and the issue resurfaces.


Actual results:

The nature of the issue is that when I double-click the tab overflow navigation arrows, the navigation buttons respond as though I had single-clicked. The same thing happens with both the left and right arrows.


Expected results:

Double-clicking these arrows is supposed to scroll "one screen width worth of tabs", as I understand it. However, once Firefox has fallen into this state, double-clicking these arrows has the same effect as single-clicking them: tabs are scrolled only one at a time.

Comment 1

[Paul Silaghi, QA [:pauly]]

Unable to reproduce on Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0.1.

Please try again on a new, empty profile (Don't install any addons into it)
http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-manager

Comment 2

[Wayne Mery (:wsmwk)]

(In reply to Paul Silaghi, QA [:pauly] from comment #1)
> Unable to reproduce on Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0)
> Gecko/20100101 Firefox/16.0.1.
> 
> Please try again on a new, empty profile (Don't install any addons into it)
> http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-
> manager

Do you still see this problem when using a current version in safe mode?

Comment 3

[Phoenix]

Resolved per whiteboard