There are a lot of similar crashes [https://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=exact&query=hang%20%7C%20mozilla%3A%3Aplugins%3A%3APPluginInstanceParent%3A%3ACallPBrowserStreamConstructor%28mozilla%3A%3Aplugins%3A%3APBrowserStreamParent%2A%2C%20nsCString%20const%26%2C%20unsigned%20int%20const%26%2C%20unsigned%20int%20const%26%2C%20mozilla%3A%3Aplugins%3A%3APStreamNotifyParent%2A%2C%20nsCString%20const%26%2C%20nsCString%20const...&reason_type=contains&date=09%2F21%2F2011%2003%3A49%3A37&range_value=1&range_unit=weeks&hang_type=any&process_type=any&do_query=1&signature=hang%20%7C%20mozilla%3A%3Aplugins%3A%3APPluginInstanceParent%3A%3ACallPBrowserStreamConstructor%28mozilla%3A%3Aplugins%3A%3APBrowserStreamParent%2A%2C%20nsCString%20const%26%2C%20unsigned%20int%20const%26%2C%20unsigned%20int%20const%26%2C%20mozilla%3A%3Aplugins%3A%3APStreamNotifyParent%2A%2C%20nsCString%20const%26%2C%20nsCString%20const... (link)] it may even be the top crasher across all versions of Firefox on Windows. Hopefully someone will come up with answers soon, meanwhile all I can suggest is ensure everything is up-to-date, and do a check for malware with various up-to-date tools/software. (see [[is my firefox problem a result of malware]]) My firefox 6.0.2 on an XP is not crashing, and although that is little comfort to you, it does suggest that if you do not have a malware problem then if you try in [[safe mode]] and with plugins disabled it should stop crashing. See also [[basic troubleshooting]]. Maybe not the best advice, but at least it should enable you to stop the crashes. Post back with how you get on. Mention specifically if you find the cause ie any particular plugin. Note also a known issue causing crashes at present is software '''''IDvault''''', do you use that ? (Software developers are working on a fix for that, and have already issued some updates)

hi.Thanks a lot. i will tell you how it works. i will try now to see if i can arrange this.

See also: *http://www.mozilla.com/plugincheck/ Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. *Shockwave Flash 10.1 r53 Update the Flash plugin to the latest version. *https://support.mozilla.com/kb/Managing+the+Flash+plugin *http://kb.mozillazine.org/Flash *http://www.adobe.com/software/flash/about/ Update the Java plugin to the latest version. *https://support.mozilla.com/kb/Using+the+Java+plugin+with+Firefox *http://kb.mozillazine.org/Java *http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)