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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Disable your Adobe Reader, make use of Firefox default PDF viewer
The pdf requires adobe reader
I solved the problem by reinstall Firefox, because when i turned off Adobe-plugin my pdf file still worked , but arrows still didn't worked. I think, that it wasn't problem with adobe plugin.