All videos display a "Comments currently unavailable" message with the comments frame collapsed. Temporarily allowing Noscript on the entire page doesn't fix it. Disabling ABP on the entire page doesn't fix it. I'm sure millions of users use the same combination of add-ons on Firefox, so how do you guys enable the youtube comments section?
Allow cookies on
www.youtube.com. Disabling cookies will show an error message instead of loading comments.
Open the Adblock preferences interface. Select 'Custom Filters' tab. Click the 'Add filter' button. Paste the below into the line that appears:
Reload any YouTube page that is currently open. Comments should now show up on YouTube videos.