2)Click on the large adblock button to open the list of blockable items (usually on the bottom of the browser)

3)Start the embedded video so that it begins to stream/load

4)Enter "object subrequest" as searchterm for the list

5)You should see 1-4~ entries, rightclick the url of the one with flv or mp4 (etc) in it, copy the adress (to add to download managers like downthemall-addon) or open it in a new tab to let firefox handle the download

Notes:
You always have to start the streaming of the video first, otherwise the object subrequest you're looking for won't show up on the list.

You can close the site that is streaming the video after you have started the download, so you don't waste bandwith.

You can also search directly for flv or mp4, but there are sometimes other file formats so searching by "object subrequest" is the easiest way to filter it if you don't knot the file format the site is using.

http://content.sankakucomplex.com/video/clannad-madness-2.mp4

If I wasnt supose to do this, please delete my comment （´д｀）