Ever since I applied to update to Firefox 27 from 26 in my Ubuntu 13.10 (which I run on a Mac using Parallels Desktop 9), I don't get a right-click menu to pop up when I right click. This is particularly annoying in Facebook, which is hard to use without right-clicks. Has anyone else experienced this? Is there a fix? If I have to, how can I go back to the previous version of Firefox?