Okay, that's extremely baffling. I see that you're correct, but the fact this is so is perturbing for me.

For my primary use of the browser over the past few months, 'fit width to view' was mandatory, as otherwise I had to constantly scroll left/right and that was an untenable approach when dealing with text beyond the width of the window, since for some reason the browser likes to render to a greater width than displayed for many documents. Even now, I see that unless I maximize my browser, maemo.org does not fit in the browser window.

To me, this seems like a rather notable usability fail.