1. Installing firefox involves dowloading the build and executing it :) , does it not get simpler than that
Well ofcourse you can get your hands dirty by building it from source.
2. How do I install plugins:
A smart trick to do that : about:plugins (shows which all plugins are installed for firefox)
And the firefox install has a plugins directory,
1. For installing macromedia, copy the flashplayer.xpt and libflashplayer.so into the plugins directory of firefox.
2. For java we can make a symbolic link.
ln -s libjavaplugin_oji.so
Installing Acrobat Reader 7 on solaris, it conflicts with the LD_LIBRARY_PATH .
A GOOD PHILOPSHY of running a program is provide a script and let the user modify the script , in acroread , is a script and in the script i unset the LD_LIBRARY_PATH ( so that is pretty fascinating)