Brand new user

I've been using PC's for years, but was given a PowerBook by a friend. 
It has OS 9 on it.

Using Mozilla, I have some problems.  I wonder if anyone knows any 
workarounds:

1.  When I read newsgroups, Mozilla (and Netscape) ask me to enter my 
username and password multiple times in each session, even though I 
check the box for the password thing to remember my username and 
password.  It's really maddening.  Any way to get this to stop?

2.  I miss the ability to just tab from the message list to the message 
body, and then back again.  Can Mozilla be customized to make this possible?

3.  Finally, I can't find any way to make the home and end keys work in 
the message list.  I've tried every combination, and every key I could 
find to make it work, but I can find no way of scrolling to the top of a 
message list except moving the scroll bar.  A real pain.

Any insights will be appreciated -- thanks!