Mulitple monitor graphics glitch
I'm experiencing a graphics glitch on my 2nd monitor which I'm using firefox 4 in. My dropdown live bookmarks are whiting out when my mouse pointer floats over them and becomes visible when they're not. only on the 2nd monitor. Also for radio / check mark buttons selections in the browser, I have to click above the radio button to select.
Opaite Mbohovái (2)
This problem is *still* manifesting in v7!!! Does nobody at Google actually use multiple monitors or something?
Have you tried installing the oldbar module?
https://addons.mozilla.org/en-US/firefox/addon/oldbar/
I had a slightly different problem to you - my site suggestion list flickered badly on my second monitor, which is to the left of my main monitor. It may be caused by the RichListBox widget not working on the second monitor, but that's just a guess. The option to disable the RichListBox was removed in an earlier version of FF, but the oldbar module fixed the issue for me.
I haven't noticed the issue you have when selecting radio buttons or checkboxes.