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Blurry text with hardware acceleration enabled.


Hi, Firefox folks.

My text (and edges of tabs) were blurry in Firefox 4.0.1 (32-bit), running on Windows 7 64-bit, with a Radeon HD 6670 with latest drivers: Catalyst 11.5, May 9, 2011. (I have no text problems at all with the latest Chrome or Internet Explorer 9.)

The problem immediately disappeared when I went to Firefox's Tools menu --> Options --> Advanced tab --> General subtab, and unchecked "Use hardware acceleration when available."

[I've edited out a "tip" of mine that I thought was working, but actually wasn't.]

I don't know how this will affect Firefox's speed, but at least I can properly read the text now.

I didn't have to disable Firefox 4.0.1 hardware acceleration with my old NVIDIA GeForce 9800 GT (which I was using on the same PC a few days ago), so this might be (at least partly) an AMD/ATI problem; I've notified them about this already.

So, either AMD/ATI needs to issue a patch, or Mozilla does, or both. Just thought you should know. Thanks for your time.

--Chaz Geary, St. Louis County, MO USA

Modified by chazgeary03@yahoo.com

Additional System Details

This happened

Every time Firefox opened

This started when...

I switched from a GeForce 9800 GT to an AMD/ATI Radeon HD 6670.

Installed Plug-ins

  • IE Tab Plug-in for Mozilla/Firefox
  • Office Plugin for Netscape Navigator
  • PopCap Games Plugin
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Foxit Reader Plug-In For Firefox and Netscape
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Google Update
  • Shockwave Flash 10.3 r181
  • Adobe Shockwave for Director Netscape plug-in, version 11.5
  • DivX Web Player version
  • DivX OVS Helper Plug-in
  • Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
  • 4.0.60310.0


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

More Information

See above, please.

  • Top 10 Contributor
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10738 solutions 96600 answers

Helpful Reply

Some have reported that it helps to Turning off Morphological filtering in the Catalyst driver.