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Suddenly I can't type in Firefox. Keyboard doesn't have any issue as everything works fine on other applications. I have tried disabling add-ons, restarting FF in safe mode, resetting Firefox, all with no success. My Firefox is version 26.0.

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Try using a previous version of FF, it can be that there was a Windows update that somehow messed something up with that version of FF. My PC usually starts acting weird after a Windows update. I then do a system restore from before the update and then all is well again.

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thanx @Stagger, Its working properly today after restarting! :) thanks again – Nitin Varpe Jan 16 '14 at 5:02

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