(In reply to comment #71)
> I have lost my session in 3.0 because I had to set my preference to 'Show a
> blank page on next Firefox startup' and had Download manager opened;
No, you lost it because you had a wrong understanding of the warning, which is originating from your flawed Firefox 2 habits. What you said about the warning and how you could click through it, thanks to session restore, is wrong even and especially for Firefox 2. Only now there's a chance to get something useful from the warning.
(In reply to comment #71)
> I have lost my session in 3.0 because I had to set my preference to 'Show a
> blank page on next Firefox startup' and had Download manager opened;
No, you lost it because you had a wrong understanding of the warning, which is originating from your flawed Firefox 2 habits. What you said about the warning and how you could click through it, thanks to session restore, is wrong even and especially for Firefox 2. Only now there's a chance to get something useful from the warning.