@GiantCowFilms The bug I found is that double clicking on the icon adds multiple event handlers (sometimes it can open two windows too), which in turn wreaks havoc spam inserting embed code multiple times (it seems to get a bit jumbled too).
Also, the shortcut Alt+B is taken here on firefox (alt opens file, view, etc. menu and B goes to bookmarks). Even then FF blocks the popup when called from the shortcut (it also says it's blocking two popups, perhaps worth investigating that).