Problematic ad script/site?

[Jughead]

Routinely having my browser (Firefox 45.0.1) lock up with a particular "waiting for..." message when accessing BODN (and nowhere else).  I assume it's an ad, and my caveman-level of ability to read what shows up when I navigate directly leads me to believe it's eBay....

Anyway, the specific site is:  dco-cdn.w55c.net

 

 

[DFRESH]

Is it one specific thread? One sub-forum? The actual baseops.net homepage? 

[Jughead]

Generally when drilling down from the main forums page to a sub-forum [say, from, https://www.flyingsquadron.com/forums/ to https://www.flyingsquadron.com/forums/forum/4-general-discussion/] or, when moving between sub-forums or "up" to a sub-forum from a specific thread.  I can't reliably repeat it, since I don't control which ad(s) will be presented by any given refresh, but it happens pretty regularly and always with that same site & "waiting on..." message.  FWIW, I can't recall seeing any actual eBay ads showing up....