Sidewise Incompatible with New Tabs Always Last

I posted a Private Suggestion on this http://sidewise.userecho.com/topic/340607-/#, but Sidewise repeatedly crashes when I have the New Tabs Always Last - https://chrome.google.com/webstore/detail/new-tabs-always-last/nldmhfnlbkkdhboedalogjpeedjbmjgi - extension enabled.

Unfortunately, I like this extension, so unless this can be fixed or another method or extension can provide the same functionality, I will likely disable sidewise (which is a shame ...)

Hopefully, someone knows a workaround.