Lewis Toomey had put the home side in command with two goals as Slough were second best, but quickly levelled thanks to a first Rebels goal from Simon Dunn and then James Dobson, before Moone struck late on with the game heading for a draw.
Brad Hewitt headed a Dobson corner into the ground and over the bar early on, but after Moone and Kings Langley’s Gary Connelly had both seen efforts comfortably saved, the hosts took the lead on the quarter hour mark.
Immanuelson Duku was the architect, charging down the wing before crossing in low to Toomey, who finished into the top corner giving Mark Scott no chance.
Hewitt succumbed to illness shortly after, with Josh Jackman replacing him to make his Rebels debut, and Slough struggled as Kings Langley went in search of a second goal.
Nathan Webb blocked a strike from Ryan Plowright as he looked to be bearing down on goal, but the hosts did indeed double their lead with Toomey again on target. He broke clear of the last defender and chipped the ball over the onrushing Scott before wheeling away in celebration.
Crucially, and against the run of play, Slough pulled a goal back within five minutes to get back into the game. Guy Hollis headed a Dobson corner back across into the six yard box, where Dunn was on hand to head into the net.
Three minutes later, Slough were level. The home side could only clear Warren Harris’ cross as far as Dobson, who from the edge of the area, struck a right-footed effort past Xavi Comas.
In a frantic end to the first half, both sides went close to taking the lead; Dunn’s shot was cleared off the line by Emmanuel Folarin, Duku and Josh Chamberlain were denied by superb blocks and on the stroke of half time, Moone’s first time shot rolled wide after Comas had come out to deal with Gavin James’ ball over the top.
The action settled down somewhat in the second half, with Dobson and Moone off-target with efforts from distance, whilst Duku had the ball in the net for Kings Langley, but his effort was ruled out for offside.
Ten minutes from the end, Dobson played Moone in but he hesitated with options to his right and was tackled before he could shoot.
But that was not Moone’s last chance as, three minutes later, he put Slough in front for the first time in the match. Dobson’s free kick from the right hand side was met by the head of Moone, who superbly steered it across the goal and past Comas.
There was to be no late drama despite the six added minutes at the end of the half as Slough held onto their lead and claimed all three points.
Kings Langley Line up
Xavi Comas, Emmanuel Folarin, Josh Chamberlain, Kyle Anthony, Stuart Deaton, Callum Adebiyi, Connor Toomey, Gary Connolly (c), Lewis Toomey, Immanuelson Duku, Ryan Plowright. Subs: Sean Coughlin, David Hutton, Dean Hitchcock, Oran Swales, Jack Pattison.