I've now tried "Deer Park" out, and although I'll stick with Firefox 1.0.4 as my default browser until the final version of Firefox 1.1 is out, it looks good!
I haven't tried the "sanitization" or fast back/forward features, but I have noticed improvements in a number of other areas.
One of the more significant (IMO) is that the long-standing
title bar/taskbar icon bug on Windows 9x has been fixed! There is now no need to improvise fixes yourself to keep Firefox from looking like this:
The options dialogue is more convenient to use and is now arranged in a tab-like fashion.
Deer Park does seem a bit quicker than Mozilla Firefox 1.0.4. Loading time was a second faster on my machine.
As a side note concerning rendering, I noticed that on Deer Park, certain monospaced text (such as the "sdt" and "sdp" designations on this forum) displays in a larger size than they do on Firefox 1.0.4, and they do not change if I increase or decrease a page's text size from the browser. I'm not sure whether or not this is a bug.
UserAgent: Mozilla/5.0 (Windows; U; Win95; en-US; rv:1.8b2) Gecko/20050531 Firefox/1.0+