(Problem with arrows )Adobe Reader doesn't work correctly

I've problem with Adobe Reader plug-in. When I have open tab with pdf file, my arrow keys don't work in other tabs in firefox, only in this tab where it's open pdf file. Also I noticed that when trying to use the arrows in the other cards, they work on a pdf file.

I'm tried to uninstall and install again Adobe Reader, but it doesn't work. Please help.

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