On 27 January 2017, O'Connor scored two points from centre-back when he captained St Peter's College to the Leinster Championship title following their 2–13 to 0–07 victory.
[4] Firman joined the St Martin's club at a young age and played in all grades at juvenile and underage levels as a dual player.
[5] On 29 October 2017, St Martin's had the chance to achieve the double when they faced Starlights in the Wexford Football Championship final.
He lined out at midfield in a second successive Leinster final on 4 July, however, he ended on the losing side following the 4–21 to 2-26 extra-time defeat by Galway.
[11] Firman was added to the Wexford senior team prior to the start of the 2017 National League but was an unused substitute throughout the campaign.
[12] On 18 February 2018, Firman made his first appearance for the Wexford senior team when he lined out at left corner-back in a 3–21 to 1–21 defeat by Tipprary in the National League.