Yes, this works pretty well. It still isn't technically full screen, but it's much larger than the default one. I do wish it was possible to open a gmail compose window without the whole gmail back-end behind it, so that I could pop open a compose tab without waiting the few seconds it takes for gmail to load, but I guess if I cared enough I could just find some lightweight smtp client.
- Hit down arrow in bottom right corner of (crappy little) compose window
- Select "Default to Full-Screen"
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