After updating the Firefox to the latest version, while using Flex debug I found the debug session did not last much and it crashed after a short period. This happens because firefox kills the debug session. Found a quick fix for the above issue:

1. Goto firefox config by typing about:config in the firefox address bar
2. Click on the I’ll be careful, I promise button.
3. Type dom.ipc.plugins.timeoutSecs
4. Find value and double click and change the value to -1

This changes the default timeout value from 45 secs to unlimited. This should solve the issue.

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