Fix Blurry Fonts Thunderbird 5.0

Like Firefox 5.0, Thunderbird 5.0 takes advantage of video hardware acceleration to improve performance. Unfortunately, like in Firefox 5.0, this can lead to blurry fonts. A quick change of a couple values in about:config should clear this issue up for most users:

  1. In Thunderbird go Tools > Options…
  2. Click Advanced Tab
  3. Click the Config Editor… button at the lower right
  4. If needed, click the I’ll Be Careful, I Promise! button
  5. Filter for each of the below values and double click to change the setting from false to true

    • gfx.direct2d.disabled
    • layers.acceleration.disabled