From the Inside Open Source blog (from APress) there comes a helpful tip for those working with Firefox and PHPMyAdmin on a lower resolution screen:

I'm currently working on an e-commerce project involving a relatively small number of database tables. However the clients table consists of 19 fields, making for difficult data review and debugging within PHPMyAdmin, even at 1280×768 resolution.

The answer is simple, at least if you're using Firefox. Firefox offers three hotkeys for changing the text size, and resultingly, the amount of text you can see on one screen.

The keys for this easy little fix use the Control key and plus (larger), minus (smaller), and zero (return to default size).