it mostly happens with the old version firefox, so i updated to the newer version, and i can say it no longer does it, but i am still weary, and continue to use Safari.
Most of the time when the pointer did zoom, it was mainly on windows-based applications. But if it happens all the time on your laptop, even on Apple based apps, then you might need your logic board checked (at least thats what I read online)
Oh yea, I also called, and Apple techie had no clue as to what i was talking about!!! Few weeks later there was a new version of Firefox Mozilla for macs
😛. I like to think I was special but whatever.
Apple really needs to get on this situation, my best advice is go to an apple store and try speaking to a technician, so they can see what your talking about.
Good Luck!!!