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my + button to open a new tab isnt working, why?

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When I press the + to open a new tab it doesn't do anything, however when I right click to open in a new tab it will do so.

When I press the + to open a new tab it doesn't do anything, however when I right click to open in a new tab it will do so.

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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...