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I may be mistaken about the cause. I'm on Linux and use FF without flash. Chromium with in-built flash (or flash emulation?) handles maps fine.

I'm also on Linux and Firefox. Ubuntu 16.04. I don't remember if Flash came with FF or I installed it. Anyway it doesn't run unless I OK it.

This would point at the interaction with FF being the issue, maybe disable all extensions first to make sure they are not messing up with something?