So a few things here: You can Google for the accessible alternative to Youtube.
There are also keyboard shortcuts built into Youtube. If you turn off the
virtual cursor, meaning you can't then use first letter navigation keys, you
can then use the letters j k and l to rewind, play/pause, and fast forward. If
it's Jaws, the keystroke to turn off the virtual cursor is insert Z, and again
to turn it back on. However, if you're listening to a YouTube and all you
really want to do is pause and get up from your seat for a break, then use the
pass through key, which in Jaws is insert 3 on the number row. This lets Jaws
ignore the next key press, so you could just press K to pause the video. Then
when you're ready, use the pass through key again and type K to resume playing.
As far as downloading to make mp3s, I found a nice free one from
www.DVDVideoSoft.com
and it's a program which installs on your hard drive, and you copy the link
from a YouTube and use the program's Paste button, then tab to download. This
program has ads, and sometimes it loses focus, but it will do the job nicely.
Matthew