UPDATE

I checked the back of the window by pulling up on it gently (it only moved 1-2 millimeters). I checked the passenger side front window which is working fine and it has the same amount of play in it.

One other side note that I neglected to mention (sorry folks). When the window is down all the way, and I put it up, it will go about 3/4 (or a bit more) up at normal speed, then just stop. Of the 10 or so times I raised/lowered the window in the parking lot at work, it stopped about 8 or 9 times. I release the window button and try again and the window goes the rest of the way up without incident (but at a much slower speed. It's the last 1/4 where the speed of the window going up is in question.

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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming .... Wow, what a ride !