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How do I stop firefox from locking up while browsing?

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Browser "locks up" at random times while browsing. I was unable to use control+Alt+Del to close the browser and had to manually shut off and restart the computer. Tried the following: Firefox refresh, clearing the cache, clearing cookies, re-installing Firefox and scanning for possible viruses. All of the above without finding a fix to the problem.

Browser "locks up" at random times while browsing. I was unable to use control+Alt+Del to close the browser and had to manually shut off and restart the computer. Tried the following: Firefox refresh, clearing the cache, clearing cookies, re-installing Firefox and scanning for possible viruses. All of the above without finding a fix to the problem.

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Firefox 40 is acting up for me.

Typed characters are delayed.

Scrolling freezes.

Screen greys out and becomes unclickable.

FIrefox 40, Windows 8.1