Hello,
This is maybe a stupid question but, is there a way to have text like these (Arial) working on firefox? I don't really know how to call it but hmm "stylish"? IE7 does it automatically ..
Here is one example: 
Thank you
Try as I might, I really
Try as I might, I really don't get what your question is. Clearly Arial is available to FF if it is on the computer, as it must be if IE uses it.
Referring to IE7 leads me to
Referring to IE7 leads me to believe you're talking about aliasing. IE7 is the only windows browser that currently supports it, and it's not something you can do with CSS.
There are image and flash based replacements that do what you're after, but it's an awful lot of hassle 
yeah they should think of
yeah they should think of something since bigger dynamic words and font-sizes really turn out ugly.