I have used Mozilla from way back when they split from Netscape....
The only complaint is the POSTDATA error where you lose all data in data fields like this if you go back/forward
If they fix that.. which I have posted bug fix requests for.. then they could topple Opera and IE which do not have those issues.
In general... I use it for email and web and find it more stable than IE/Outlook/Eudora etc...
"The only complaint is the POSTDATA error where you lose all data in data fields like this if you go back/forward "
Are you sure that problem is still there. I don't usually have that problem. Although I do remember getting and error before where it needs to recover the data.