Works great but..... Rated 3 out of 5 stars
As at least one other user pointed out it definitely needs an option to exclude certain entries from being moved to the new 'More Tools Menu' that is generated. For instance I'm primarily a Windows user but I do use Linux from time to time and have installed the 'Tools>Options... for Linux' Addon to add an 'Options' entry to the standard 'Tools' menu in the Linux version of Firefox (since that's where it is in the Windows version to access Firefox configuration preferences/options, just makes it easier for me to remember). But with MTM it moves that entry to the new menu it creates, defeating the purpose of adding the addon that created the 'Options' entry in the first place.