Firefox/3.5.3 Crashes Once or More Daily

I am running Windows XP SP3 and Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729). Firefox crashes at least once a day and sometimes several times a day. I was submitting crash reports with detail about the state of the browser at the time of the crash, however, after submitting several of these detailed crash reports (including my email address so I can be emailed statuses about cause/circumvention/resolution), and never receiving a single response/reply/status, I opted to just submit the crash report without details. The one constant is that I run the My LastPass Vault in a tab on every browser session. I have included this information in the detail of the crash reports. However, the tab that crashes varies and there doesn't appear to be a constant.