Well, I've been living with that since I was only in LiveJournal.
I always though it has to do with some FF add-on and never thought more about it, but at least in my case, the YouTubes I got were different each day. Why FF decided one particular YouTube should be showing up all over my f-pages, is something I have no clue about.
And about DW Support, I only once needed them, and they were both, quick and helpful.