Safari niceness

I have found a very nice thing on Safari, a little thing, really, but really handy. You can resize the text input boxes, making those bigger, if you run at a higher resolution than the one the site designed it. Since I can run my monitor at 1440x900, this comes very, very handy indeed.
There is not a similar option for Firefox, neither on Os X or Windows (I have not tested on the Safari version for Windows)