Interesting. When I tested your prototype by publishing locally and opening in Firefox, it worked. Then I updated Firefox to latest version (68.0.1 on Win10) and it no longer worked. I also created a new prototype with button to link to “Page 1” (just in case Firefox was blocking new windows/tabs) and that does not work when running locally but does work when previewing and does work when published to AxureShare. For grins, here is your prototype on AxureShare, which works fine for me in Firefox : https://ysr06n.axshare.com
So it looks like Firefox has changed something to block local file:/// pages from running. Might want to submit this as a bug to support@axure.com and see what they say about it. Until then, you might just need to use a different browser for running prototypes locally.