641368 - Tab title loses subpixel anti-aliasing on this page when only one tab is open

Status: UNCONFIRMED

(Core :: Graphics, defect)

Description

[Emanuel Hoogeveen [:ehoogeveen]]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b13pre) Gecko/20110313 Firefox/4.0b13pre
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b13pre) Gecko/20110313 Firefox/4.0b13pre

I've noticed that in the attached URL, the tab title switches to grayscale anti-aliasing when all other tabs are closed. As soon as I open another tab, it visibly switches to subpixel anti-aliasing.

Reproducible: Always

Steps to Reproduce:
1. Open the attached URL
2. Close all other tabs
3. Open another tab
Actual Results:  
Tab title switches between subpixel and grayscale anti-aliasing.

Expected Results:  
Tab title should maintain subpixel anti-aliasing.

I don't know how common this bug is - it doesn't happen on every page of mozillaZine. I only noticed it because I was taking a screenshot for the topic in question.

Comment 1

[Emanuel Hoogeveen [:ehoogeveen]]

Ah, I should mention: about:support shows GPU Accelerated Windows1/1 Direct3D 10. I haven't tested with hardware acceleration / DirectWrite disabled.

Comment 2

[Florin Strugariu [:Bebe]]

Can u provide a screenshot for this bug please.

Comment 3

[Steve Scott (pxbugz)]

This sounds like it might be the same issue as Bug 635354

Comment 4

[Emanuel Hoogeveen [:ehoogeveen]]

Attachment: Comparison screenshot

Alright, here's a comparison showing the tab title with only the one page open, and the tab title after opening a new tab (I'm using the Personal Titlebar extension, so the title bar looks a bit different from stock).

Comment 5

[Emanuel Hoogeveen [:ehoogeveen]]

I'm seeing this on more pages than just the one I posted in the bug description. Examples:
http://www.mozilla.org/projects/firefox/prerelease.html
http://www.tweakers.net (main page)
https://resulka.wordpress.com/2011/03/23/lets-play-bully-part-13/

Also tried it with a clean profile (to rule out Stylish and the like) but it still happens.