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Pull down menus will not open

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When I opened Firefox this week all pull down/drop down menus would not open. They flicker but do not pull down. I am unable to open the following "This happened" drop down menu to answer the question. What can I do to fix this? I am also not able to get bookmark to work either from the bookmark window or clicking on the right button.

== I opened Firefox this week

When I opened Firefox this week all pull down/drop down menus would not open. They flicker but do not pull down. I am unable to open the following "This happened" drop down menu to answer the question. What can I do to fix this? I am also not able to get bookmark to work either from the bookmark window or clicking on the right button. == I opened Firefox this week

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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...