Do eBay keep overruling your browser settings? Here is how to stop the site from opening new tabs in Firefox. Other sites ought to defer as well, but eBay is the only one I've found that repeatedly wants to overrule the user's settings.
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In the address bar, type about:config
Accept the risk and continue
Show all options
Set browser.link.open_newwindow value to 1
Set browser.link.open_newwindow.restriction value to 0
Click the tick to confirm.
I haven't added music to this, as I thought you might need to press Pause on occasion while trying it, and having music stopping and starting might be a bit of a bad listen.
YouTube are sometimes putting an advert at the beginning of some of my videos. That's not my choice and I can't do anything about it - sorry for any inconvenience.