Loaded the extension then attempted to follow the youtube Linux instructions for loading the Firefox extension, which were in a different language, in CHROME(!), and flowed so fast that I had to stop and back up several times. Could not replicate the steps, nor could find the resulting toolbar icon. I've been running Ubuntu for 14 years now, and am a programmer myself. Yet this was hands down the most awkward, convoluted installs I've ever seen. Not worth any more time or frustration.