Storyline not completing in Firefox

Hi, all.

I'm still using Storyline -- I can't get the budget for the annual subscription to 360, so I'm stuck with it. We just launched annual safety training, which I've updated using the same base Storyline files for the last several years. For the first time, we're using Workday instead of Success Factors as the LMS. Everything tested fine, but apparently, nobody tested in Firefox. Completions are not being captured for anybody taking the course using Firefox. Any idea why or how to fix this? Many thanks...

/shel