User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 This happens after I installed FF3 - but not right away. Maybe a day later. I use Eclipse to run Flex apps in debug mode in browser. My Flash version is 9. Every time I run debug mode in FF3 - it suddenly crushes. No error message is seen, no nothing - it just VANISHES. I had to change my browser to IE - and it doesn't crash. Reproducible: Sometimes Steps to Reproduce: 1.Open Eclipse. Create new Flex project 2.Run the project in debug mode on FF3. This may not happen for some time - and than start to happen. Actual Results: FF3 opens for a second - and than vanishes. Expected Results: Do not vanish... :) No special theme. No error message when crashing. I ran Eclipse 3.3 with Flex builder 2.0.1 plugin. I use Flash 9.