Youtube is a hellhole.
They don't usually last forever, but Youtube has some real treasure troves.
Tips to make Youtube less shit:
To make a video URL start at a particular time you can define it in minutes and seconds by adding &t=XmYs
to the end, where X is the minute and Y is the number of seconds, for example http://www.youtube.com/watch?v=rRTSSzccALA&t=1m0s
Youtube's got comepletely unusable for me now. Dunno what combination of Firefox and ad-blocker settings it is, so I've started using Freetube for watching videos. It works with redirect add-ons so that videos always open in the program, and you can block channels. On Android I've been using Pipepipe, switched to it after Newpipe stopped working and was taking to long to release the fixed version.
Other ones I've seen, some I've tried: