Why can't I stay signed into chat? I get the message: You have been disconnected from chat because you have signed into Yahoo! Messenger from another computer or device.

I get disconnected when I try to read my mail. I didn't sign on from another computer or device. I need to keep chat open and I don't know how to do it.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
Your above posted system details show multiple Java Console extensions.<br />
You can uninstall (remove) the Java Console extensions and disable the Java Quick Starter extension, you do not need them to run Java applets.
See http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions
See also http://www.java.com/en/download/help/quickstarter.xml - What is Java Quick Starter (JQS)? What is the benefit of running JQS? - 6.0
Disable the Java Quick Starter extension: Tools -> Addons -> Extensions<br />
Control Panel -> Java -> Advanced tab -> Miscellaneous -> Java Quick Starter (disable)

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