Remove the interior door panels, tighten the window tracks. There should be one or two bolts that hold the window tracks in place. The only other place it would be loose is in the window regulator bolts. Either way, you have to remove the interior door panel, good luck!
I finally got around to it, the bolts that you circled had somehow worked loose. Maybe the constant wear on my 10 year old car had wiggled the bolt off. Here's another tip - you can bend the track a little to tighten the track a little more. Of course you don't want to tighten it too much tho.
You can use any grease you want. Molyben would work, white lithium spray in a can, I don't suggest wd-40 since that is more of a lube, I don't know how it would react with the plastic clips, rubber, or window tints either.
PS, I forgot to circle that extra bolt. The rear piece is 2 bolts, not 1. If you look at the attachment of the regulator removed, you can clearly see the 2 bolts, but you probably figured that out by now
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