Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/16.0 Firefox/16.0 ID:20120628010552
Steps to Reproduce:
1. Start Firefox with New profile
2. Make sure MenuBar disabled
3. Double click TitleBar to toggle window size (Normal/maximized)
Toggle window size Normal/maximized
Bug 733630 was backed out and a respin was requested.