Sorry you are having a problem, but Mozilla has nothing to do with http://engine. 4dsply. com /mediahosting.engine? That domain is probably supplying content for the page that is loading when that crash occurred or you have some Malware on your PC which is contacting that domain. Let's try to deal with the crashing. ---------------- Please follow the steps below to provide us crash IDs to help us learn more about your crash. #Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below. #Copy the '''5''' most recent Report IDs that start with '''bp-''' and then go back to your forum question and paste those IDs into the "Post a Reply" box. ''' Note:''' If a recent Report ID does not start with '''bp-''' click on it to submit the report. (Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.) ;[[Image:aboutcrashesFx29|width=500]] Thank you for your help! More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.