Further to 'OK, but...' Rated 1 out of 5 stars

I don't understand your failure to understand my complaint. Your add-on promised a 360kbps download but I got one at roughly double that bitrate. I didn't play the video in the Youtube player at all. And Get Info on my computer confirmed the file size as 120MB approx.

The one-star rating is for your reply to my original review.

This review is for a previous version of the add-on (1.3.8.1-signed). 

360p is not a bitrate and doesn't mean 360 kbps. 360 is just the number of vertical pixels, the resolution of the video.

1080p = 1920 x 1080
720p = 1280 x 720

Please read the extension's description and you'll find all the resolutions, includng 360p. The most common resolutions for 360p are 480x270 and 480x360. And don't tell me that's a misleading name because it's the name used by YouTube (try clicking the setting icon from the player).

OK, but... Rated 3 out of 5 stars

Easy to use, downloads at a respectable speed, but gives wildly incorrect bitrate information. I've just downloaded a video, 22' 09" in length, from Youtube using this add-on, selecting MP4 360. This should have used roughly 60MB of my data transfer allowance. In fact the bitrate was roughly double the one stated and it used about 120MB. This is a serious defect for the many people who, like me, have a monthly data transfer limit. Could the add-on possibly be fixed so that it does as it's told, or at least tells the truth, about the download bitrate?

This review is for a previous version of the add-on (1.3.8.1-signed). 

I don't understand your complaint. When you download a video, a Firefox dialog shows the filesize of the video (for example: 30 MB). The extension only finds the URL of the file and Firefox downloads it. That's all.

I'm not sure what software you've used to measure bandwidth, but it's likely that it measured both the YouTube player transfer and the file download. Obviously, the video starts playing and your browser downloads it in the cache.