Ok, I updated the script with a event.preventDefault in the click handler that will avoid the "following the link" issue. CNN is still problematic in that it's possible to delete the video playing but the div stays there, and at that point you might as well just hit the pause button. I'll have to figure out the capturing on that.

If your menubar is showing in Firefox (View->Toolbars->Bookmarks Toolbar), you can drag it the exact same way. You can always just copy the bookmarklet with a right click, copy link, and then add a bookmark for the current page (⌘D) and edit it, pasting the copied link into it and renaming it.