To open forms on canadian immigration/ travel website for MacBook- this is what worked for me!!

The workaround that I found is to go to Chrome Settings.  Click Advanced and go to Privacy and Security.  Click Content Settings (near the bottom of that list), then scroll down to PDF documents (fourth listed from the bottom).  I turned on 'Download PDF files instead of automatically opening them in Chrome.'  The full xfa-based pdf downloaded and when I opened it, the full document was displayed in acrobat reader.