Gmail formatting icons appear as blank spaces in Firefox 4.0 How to correct this?

I find that,after switched over to Firefox 4.0, the formatting icons in Gmail "compose mail" page appear as blank spaces. How to get back the display of these icons?

If images are missing then check that you aren't blocking images from some domains.
See:
* http://kb.mozillazine.org/Images_or_animations_do_not_load
* Check the permissions for the domain in the current tab in Tools > Page Info > Permissions
* Check that images are enabled: Tools > Options > Content: [X] Load images automatically
* Check the exceptions in Tools > Options > Content: Load Images > Exceptions
* Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images)
There are also extensions (Tools > Add-ons > Extensions) that can block images.
* [[Troubleshooting extensions and themes]]

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