Before Firmino scored, I was furious Salah didn't pass the ball to Mane at that point
I know it's a bit 'body language expert' but I thought it was telling that Mane a) didn't really celebrate Firmino's goal instantly and b) kind of gave a perfunctory high five to Salah when he got his own 2nd.
***THAT SAID*** I'm not suggesting for a minute that there's an issue between them or anything like that, rather that Mane's reaction suggests to me that Salah had made a bad choice. Salah's too, for that matter. I wouldn't be surprised if Klopp made note of that move in the 'things to improve' video.
It's something I actually really like about Mane that, although he can be somewhat inconsistent with his touch and execution, I think his decision making is usually very good. I don't often find myself tearing my hair out thinking 'why did you do that?' with him. It seems more regular with Salah, certainly in terms of taking a touch too many, and with Firmino it's generally great and then every now and then he has a game where almost every touch seems to be a 'what the hell was that, Bobby?' type moment.
That that said, Mo's assist record should put to bed any idea that he's problematically selfish. More that he can sometimes be typically 'strikerish'. The flip side of that is that he sometimes scores from shots or situations where there wasn't even an attempt on, but somehow Salah can scent that goal and be single-minded in his pursuit of it.