846130 - Text and images render strangely when scrolling up or down a page.

Status: RESOLVED DUPLICATE of bug 812695

(Firefox :: Untriaged, defect)

Description

[[e-mail]]

Attachment: firefox19_bug.png

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
Build ID: 20130215130331

Steps to reproduce:

Updated to Firefox 19.0


Actual results:

Scrolling up or down a web page causes blocks of text to render almost unreadable with blurred/discoloured edges.

When the text is scrolled out of view it comes back into view "clean", but when it hits a certain point the problem appears again.

Text becomes normal again if the focus goes off the tab or window, but the problem recurs as above.


Expected results:

Text should remain crisp and readable.

Comment 1

[[e-mail]]

Attachment: side-by-side comparison of correct rendering and broken rendering.

Update: I've noticed that this bug applies to the rendering of images as well as text.

Comment 2

[Loic]

Could you try with HWA disabled, please.
See http://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration (restart Firefox to apply)

If that doesn't change anything, try with a fresh profile: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Comment 3

[[e-mail]]

Hi Loic,

That appears to have made a difference - it's not happening now.

Comment 4

[Loic]

Which action? Disabling HWA or starting a new profile?

Comment 5

[[e-mail]]

Apologies. Disabling HWA.

Comment 6

[Loic]

It sounds like a dupe of bug 846073.

Comment 7

[[e-mail]]

I'd say you're right. The problem looks exactly the same.

Comment 8

[Loic]

Did the issue appear after a Win 7 update?

Because after the recent update KB2670838 (which is needed to install IE10 on Win 7 [1]), many users have reported rendering issues.
Could you check in Windows Update if you installed KB2670838.

[1] http://support.microsoft.com/kb/2670838/

Comment 9

[[e-mail]]

It did, actually, and I did. In fact, both updates happened at the same time - Firefox updated after I rebooted for the Windows update.