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Fireline is a good stuff but a pain to tie a knot with. If you are using the mono as a backfill on the spool, I've had pretty good luck with the blood knot. (pic in the knot link). Held well, but never did have to test it with a fish ripping line off the spool past the knot.
If you're using the mono as a leader, my preference is to use a barrel swivel as the connection point. If it's connecting mono backing to your fireline you might try a nail knot.