Strange default zoom in Firefox 22.0

Question

I have a completely fresh installation of Firefox 22.0 on Windows 7 and I just opened a website.

The website appeared to be zoomed (fonts as well as images) so I hit

Answer 1

1) Type "about:config: in address bar
2) search for "layout.css.devPixelsPerPx"
3) change value of "layout.css.devPixelsPerPx" from -1.0 to 1.0