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Do the windows work from either side?
Is the mirror control on the door?
I came back but your question was closed. I see you reopened it.
OK, here's the deal....They do all share a common ground but the kicker is that it appears the other windows also use those ground paths. It should be checked, but I don't have high hopes for it being the problem. The wires come together and ground at "Behind LH side of cowl". The grounds are all black wires. Your power supply for the windows comes from fuse #14 on the R/LB wire to the master switch. The same power wire "tees off" and goes to the right switch also so if one is getting power to one door and not the other, there has to be a break in that wire coming into the drivers door.
The power mirror control gets it's power from fuse #8 and comes into the door on the LG/Y wire to the switch. This switch also shares the same ground with the windows. This should be enough info to get to the bottom of it. If you end up needing the schematics, I can scan and post them later but you have the pertinent info from the circuit.