Issue: Mailtrack disables itself when you close Chrome and open it again.
Solution: Make sure Chrome isn't deleting site data (cookies) automatically when you close it:
1) Copy and paste chrome://settings/content/siteData into Chrome's address bar and press Enter.
2) Make sure Delete data sites have saved to your device when you close all windows is turned off.
If you'd rather keep that option on, you can add mail.google.com and mailsuite.com under Allowed to save data on your device on the same page so Chrome keeps their data.