Use WebEx with Linux
From Linuxintro
So is your desktop a Mac, too, or are you just akntilg Firefox generalities? I'm guessing the former, but it could be the latter since Firefox doesn't seem to have changed much in the leak regard since I used it on Linux a year or year and a half ago (and I thought the 2.x to 3.x upgrade might fix some of the leakage, but doesn't appear to).