The Celtic captain crossed the halfway line to approach Finnish international Kamara during the warm-up for a pre-match show of support after a week where the midfielder alleged racist abuse during a game and was subject to vile online abuse along with team-mate Kemar Roofe.
Brown’s simple handshake with Kamara during Rangers’ rondo was praised by Scotland hero McFadden as a significant move on a human level that transcends football rivalries.
The Sky Sports pundit said: “It’s a huge gesture. It doesn’t look much, just walking up to him, but it says he stands together.
"I think you can see Glen Kamara’s face is surprised Scott Brown has approached him but it’s great to see.
"We are trying to highlight it and use football to combat it but they’re still people. This is personal, on a personal level put rivalry aside, who you support and what you think, aside and it just shows we are all together and we do support Glen Kamara in this.
"It’s fantastic to see that Scott Brown as the captain of Celtic, fierce rivals of Rangers, can put that aside before a huge game like this – it was good to see.
"I think Glen Kamara was quite surprised with what was happening, but it shows we are altogether and want the same thing.”
Rangers and Celtic drew 1-1 with first-half goals from Mohamed Elyounoussi and Alfredo Morelos.