Thanks for clarifying that. I assume when you use the term "Mac" you are referring to the Apple OSX computer and not the Apple iPad (IOS) computer...correct?
The reason I ask is that there are technical differences between browsers that run on the two Apple product variants (see http://arstechnica.com/apple/2016/01/new-chrome-for-ios-is-finally-as-fast-and-stable-as-safari/).
PS: No one knows how long this forum will keep running with the disappearance of the MSMW staff and owners. If you wish to ensure you can continue to communicate w.r.t. the BackStop Themes, email me at firstname.lastname@example.org and I will put you on the new community mailing list.