849625 - Sometimes when scrolling or simply moving the cursor around some sections of text will become extremely pixelated

Status: RESOLVED DUPLICATE of bug 812695

(Firefox :: Untriaged, defect)

Description

[bugzilla]

Attachment: An example of pixelated text on Wikipedia. This is an extreme example with almost all text pixelated. Note that you have to see this picture in 1:1 scale.

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130307075451

Steps to reproduce:

Since Firefox 19.0 this problem has started to appear on many different websites.
Sometimes when I scroll or move my cursor over a block of text, some sections of text will become extremely pixelated. Only text is affected, not images.

Disabling hardware acceleration fixes this.

Duplicating this bug is a bit tricky since it seems to happen at random times at random websites. It happens very frequently though (several times an hour).


Actual results:

A block of text becomes pixelated until you manipulate it by either moving the cursor over it or highlighting it. 

I want to stress that this is NOT a local hardware issue. Several people have started having this problem since Firefox 19.0, as this reddit thread proves: http://www.reddit.com/r/firefox/comments/19cmcs/pixelated_text_after_mouseover_in_ff_19/

This happens in both Firefox 19 and 20. My current user agent is:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0

I'm using a laptop with an ATI Mobility Radeon HD 4500/5100 Series graphics card. My driver is version 8.970.100.300 dated 7/3/2012.

Comment 1

[therube]

DUP Bug 812695 - [D2D] Text Rendering Issues due to Windows 7 Platform Update KB2670838 (MSIE 10 Prerequisite)