Early August ripening would be perfectly normal for Early Girl (I'd actually expect the first ones to start ripening in late July, but it really depends on how much sun they get and if they got chilled in the spring). I have one sort that usually starts ripening in mid to late July. I'm not familiar with Glamour, so I don't know if yours are early, late, or on time.

There are a million reasons for the leaves to turn brown. How are they turning brown? Are there a lot of leaves turning brown? Is it just the bottom leaves? Are the non brown leaves still a deep green, or are they turning yellow in patches?

This time of year it wouldn't be unusual to see some of the leaves dying off - more so on some plants. If it's a determinate and it's finished most of its tomatoes, then the plant would be dying back naturally. If the plant is still in full production then it might just need a dose of fertilizer. When was the last time you fed them? Also if the plants are syill forming lots of tomatoes then the plant might need more water.

What I do to my tomato plants this time of year is to cut off any flowers that form after this point. Unless they're cherry tomatoes, they'll never get big enough to ripen. I also cut off all growing tips of the plant - they've usually pretty well stopped growing at this point, but it helps direct future growth to the tomaotes. When the first frost threatens I go out and pick every tomato on the plant, no matter what it looks like - this is usually mid to late October. Ones that are almost as big as they should be will ripen without much trouble inside. Ones that are about half as big as they should be have a chance of ripening, but they won't be as good as the bigger ones. Anything smaller gets turned into salsa.

BP