Just wanted to check on this - if I'm opening and a player after me has posted out of turn, do I just treat them as a limper? Or are there other considerations?

Example below - I'm opening from MP, CO has been sitting out a couple of orbits, and has just posted SB & BB.

PokerStars No-Limit Hold'em, $0.05 BB (6 handed) - PokerStars Converter Tool from FlopTurnRiver.com

UTG ($6.41)
Hero (MP) ($8.10)
CO ($11.15)
Button ($4.12)
SB ($5)
BB ($5)

Preflop: Hero is MP with J, J
1 fold, Hero bets $0.25??, etc, etc