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I can't use any drop-down menus

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When I click on a drop-down menu, sometimes it will flash for maybe 1/100 of a second. So some menus will not allow me to complete what I am working on. Below is a good example. I have no way of knowing what you want in that text box

When I click on a drop-down menu, sometimes it will flash for maybe 1/100 of a second. So some menus will not allow me to complete what I am working on. Below is a good example. I have no way of knowing what you want in that text box

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Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...