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I have never been very fond of Safari so I haven't tested it, but I'm assuming this is likely a Firefox only problem.

The only thing that can be done is avoid interlaced/progressive images when possible. I do really hope Mozilla fixes it sooner rather then later to make this issue mute.

Radioactive said:
For the moment I can only recommend you tag an image with 'interlaced' if you come across one.
I would have no problem tagging images I come across with an 'interlaced' tag as long as admin2 and/or petopeto are okay with it.