just to let you know, I'm a newbie myself so fare warning alright.
Mozilla is cool and all, it's different and that's worth something, I used it for the last year, but it is really frustrating when your web browser dosen't work. After all , that is one of the most critical pieces of your computer software.
I had the java problem as well. I fixed it by first going to netscape.com and downloading the new version of netscape for linux. This should basically overwrite your mozilla installation, keeping your bookmarks, settings etc... I have found that netscape is much cleaner looking, loads much much faster and I imagine that it will be easier to update in the future. It also has a nice pop-up blocking feature.
Then, to get java working, you need to download the newest java runtime environment rpm package and install that. After that you have to create a link between a certain java plugin and your netscape plugin directory. The best way to start this whole process is to go to the help menu ant the top of your browser and open "About Plug-ins" from there investigate how to add java support to your browser.
To install files that are rpm.bin you first have to make them executable by typing:
chmod +x filethatIwanttomakeexecutable.rpm.bin
then type the ./ command which tells linux to run that file. so...
this usually unpacks the file to .rpm format.
to install an RPM file (RED HAT PACKAGE MANAGER) you have to be logged in as root
then your root password (if you don't know it your fucked)
rpm -i file.rpm to install.
you could also type:
rpm -ivh which adds extra functions like telling you more info on the install and giving you a nice bar to tell you the percentage of install complete.
to untar and unzip .tar.bz files you type:
tar -xvf file to untar
or you can type:
tar -zxvf to unzip and untar (detar ? whatever) all in one step.
hope this helps, I'll check back on you.