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human
[Avatar] Did the other Avatars have to deal with any issues with Fire Bender when Sozin's Comet appeared?

Kyoshi lived through the appearance of the comet at least twice, and Yangchen probably also saw it. So did either of them had to deal with issues caused by the buffed Fire Benders? I know Kyoshi fought a lightning bender in her youth, and there would have been some big problems if that guy got buffed by the comet.
gpt
Likely yes. The comets existence was documented well before Sozin's time and, while it's never stated outright, it's implied that its effect were known as well. 

It was probably treated the same way as the effects a full moon had on Waterbenders. 

There undoubtedly were firebenders that took advantage of the comets passing but few really had the vision or drive that Sozin had.