Why you make this rubbish version of Firefox? Did you test it before release?
I am fetching lot of problem in using Firefox. 1. I can't use firebug properly. Always it hanging my work. 2. Its restarting many time during my work. 3. Also lot of many problem I am fetching.
The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.
If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues.
If you can give us more specific information, we can try to help.