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what does the +1 rule for firewarrior teams mean

"1+", not "+1"

In a codex, if a unit says "0-1" you may have as few as zero or as many as one of the specified unit in a legal army list.

If a unit says "1+", you have to field at least one of that unit to have a legal army. Tau Fire Warriors and Space Wolf Grey Hunters are the two which leap to mind.