I see that you have Adblock Plus installed. It's not a Firefox problem. Just
update your Adblock Plus filter subscriptions and the problem will go away.
This looks like your bug:
https://adblockplus.org/forum/viewtopic.php?t=7767
** Changed in: firefox (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/891073
Title:
cannot type any character in google chat
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