Comment 24 for bug 805136

For the main account setting pane there are a couple of things that could be done:
* Get rid of the header (says on the side already)
* Get rid of the Default Identity + explanation (it's neat, but it eats up three row of space for something that a majority of TB users might not use since the only have one identity?)
* Cut down the Signature text field from 5 rows to 3 or 4 rows.