You have to disable the 2D accelerated graphics
in the newer versions of Firefox and Thunderbird. This is a copy of a KB article I saved.

The following applies to Firefox version 4 or Thunderbird version 5 and newer.
1. Launch Mozilla Firefox or Thunderbird.
2. In Firefox, press Control-L to open a new link.In Thunderbird, select the Tools menu followed by Options. From there, choose the advanced listbox item, Tab to the categories tab control, and Left-Arrow
to General.
3. In Firefox, type "about:config" and press Enter
.In Thunderbird, press Alt-C to open the configuration editor.
4. If you are presented with a dialog which warns you about the dangers of making changes, Tab to the "I'll be careful, I promise!"
 button and press Enter.
5. At this point you should be out of Browse mode and on a filter Edit Box. If not, turn off Browse mode by pressing
Control-Shift-A.
6. In the filter Edit Box type direct2d.disabled
7. Press Tab to get to the list of filtered entries and you should see one called "gfx.direct2d.disabled" with a default value of False.
8. Press Enter to toggle this value to True.
If enter doesn't work use the Application key to open a context menu and select the toggle option.
9. Press Shift-Tab to get back to the filter Edit Box and type
layers.acceleration.disabled
10. Press Tab to get to the list of filtered entries and you should see one called "layers.acceleration.disabled" with a default value of False. 11. Press Enter to toggle this value to True or Application key to open the context menu.
12. Press Control-W to close the configuration window.
13. Restart Firefox or Thunderbird.
you should now be able to use the mouse pointer to review web pages while using Mozilla
Firefox version 4 or emails with Thunderbird version 5 and newer.

Hth,
Tom


On 12/15/2011 5:39 PM, Dave bahr wrote:
Hi,

I am currently unable to read the thunderbird 8 window with we 7.5.2 and
thunderbird 8. All I can read is the title of the top of the window. I
think I was shown a workaround but I can't remember what it is. any
thoughts on this one? thanks,
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