I recommend you to start with this article to get R12 up and running.
Firefox 3 does not work with R12. I could get forms to work however framework pages had problems with buttons. So install Firefox 2 instead.
For R12.0.4 on OEL desktop you want to use JRE 126.96.36.199 otherwise you have to fiddle with the context file.
You can always connect to the EBS from Windows but you want to test if the EBS stack works at all first.
I tried and could not get it to work in Linux with any other JRE version.
Download Java plug-in JRE 188.8.131.52 from:
Install JRE using this script (java.sh):
The script is using the plugin in …/ns7/… otherwise Firefox will regularly crash especially “manage addons” in preferences.
First ensure no NP* plug-in files exist in C:\Program Files\Mozilla Firefox\plugins:
$ del C:\Program Files\Mozilla Firefox\plugins\NP*
Manually copy the correct java version plug-in to the Mozilla plug-in:
$ copy C:\Program Files\Java\jre1.5.0_13\bin\NP* C:\Program Files\Mozilla Firefox\plugins
In case you have more than one version of java installed you may need to disable Mozilla Java plugin scan.
Enter the URL: about:config like this:
In the filer box enter JRE and you will get:
Double click on the value and update to 1.9 which is a java version that does not exist yet and hence essentially disables the java plug-in scan.
Close and restart the browser and now 1.5.13 should always be the default.
Enter the following URL in Firefox to connect to EBS
Login as SYSADMIN and password SYSADMIN