[Was] The best of many YouTube sidebar removers I've installed most recently. Does not break YouTube as do others I've tested. No more distractions! Unfortunately I cannot find what if any privacy concerns exist in this add-on. Removed stars since I do not see a developer link disclosing a privacy policy.
UPDATE: AdBlocker Ultimate breaks this add-on and at least one other. Just an FYI in case anyone using AU says this add-on doesn't work

Worked instantly, no reboot or anything. For a second you do see some grey rectangles where the content would be before they're wiped off but that is no problem at all.