For the fonts, I mean having the "sharp" antialiasing of Photoshop. Fireworks is completely unable to not have smooth pixels on the the top of the fonts.
Try making your text images at 2 or 4 times the size you ultimately want, then reducing to 50% or 25%, respectively.
Actually, that doesn't work. Anyway, if you search on Google for "antialiasing Fireworks", it seems that I'm not the only one having problems...
I understood that what I need is the "sharp" antialiasing from Photoshop, which simply doesn't exist in Fireworks, which is a shame...
Here is an image that describes the problem :
No solution for the moment...
Up to Fireworks version CS3, the text engine was Macromedia's. From CS4 onwards, the text engine in FW was replaced by the engine from Photoshop. It's the same code. However, FW renders directly for the screen, where PS is intended for print, so there's a difference. If you don't like the results you get from FW and you're not willing to do the "make it bigger then reduce" workaround, then you can always export text graphics from PS and insert them into FW.
Of course, if you do that, you'll get into the "save for Web" color problem. (PS exports with color profiles; FW does not, as most browsers do not use color profiles and certainly CSS and HTML colors do not have profiles applied.)
Frankly, I prefer doing all the stuff in Photoshop than writing some texts in Photoshop and then export it for Fireworks. It's just a waste of time...
You can have symbols with "smart objects", and pages with "layer composition". That's not optimized, but that's better than exporting text every time you need it. Shame for Fireworks.... It was pleasant to do wireframes with it.
Your workaround doesn't make the antialiasing seems like the "sharp" one from Photoshop, and is not related in any way.
And if you have a look, the difference between Fireworks and Photoshop is just a matter of color strength. The first one is just lighter.
As for colors, you can get rid of the profiles when exporting with photoshop. Or use a "monitor color" profile while working in Photoshop. You'll see that you have the same colors inside Fireworks.