I have been using Gmail Chat (also called Hangout) for a long time. Suddenly since the last FF updates, it's no longer work properly. Sometime the chat was sent out, sometime it won't. I can use it with Chrome without any problems. So I know it's not Gmail/Google problem, rather a Firefox problem.
Does anyone know how to fix it?
Any suggestions/comments are much appreciated.
There are alot of add ons there, please first try Safe Mode to make sure its not an interaction between the update and an add on:
Second,try logging in and out as well as deleting old cookies: Right click on the webpage > Click on "Show Page Info" > Click on Permissions, "View Cookies" and delete all the cookies.
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Thank you for your response. This is not an add-on. The chat/hangout is part of Gmail, which has nothing to do with Firefox (though there's an add-on of it, but I didn't install it). I have been using this Gmail option WITHIN Gmail for years.
I cleared my cookies/cache every morning. So that's not the problem either.