The first minor version of FF 4 is out, and none of the immediately obvious (to me) bugs seem to have been fixed.
- Some fonts still render at a completely different size to before (and all other browsers). Corbel, from the MS Office/Vista stable, is a particular offender. Calibri is slightly different too, resulting in inconsistent spacing and paragraph sizing between browsers. - Its print engine sends everything as an image, meaning stupidly over-sized and non-indexable or copyable PDFs. - Color management still not compatible with ICC4 monitor profiles = broken for practical intents and purposes.
This is a pretty poor showing really. The font issue has big implications for type design on websites - forget old MSIE bugs, now we have Firefox rendering the most basic of things (text) inconsistently and unpredictably. It's incredible.