Jre 6u20 firefox-1.4

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http://www.java.com/en/download/help/linux_install.xml#selfextracting
Download java jre-6u20-linux-i586.bin from http://javadl.sun.com/webapps/download/AutoDL?BundleId=39485
To install the Linux (self-extracting) file
Follow these instructions:
1. Change the permission of the file you downloaded to be executable. Type:
chmod a+x jre-6u20-linux-i586.bin
2. Verify that you have permission to execute the file. Type:
ls -l

3. Change to the directory in which you want to install. Type:
cd
For example, to install the software in the /usr/java/ directory, Type:
cd /usr/java/
Note about root access: To install Java in a system-wide location such as /usr/local, you must login as the root user to gain the necessary permissions. If you do not have root access, install the Java in your home directory or a subdirectory for which you have write permissions. Or you can type sudo nautilus
4. Run the self-extracting binary Type:
./jre-6u20-linux-i586.bin
The license agreement is displayed. Review the agreement. Press the spacebar to display the next page. At the end, enter yes to proceed with the installation.
5. Java is installed into its own directory. In this example, it is installed in the /usr/java/jre1.6.0_20 directory. When the installation has completed, you will see the word Done.

6. Verify that the jre1.6.0_20 sub-directory is listed under the current directory. Type:
ls

Enable and Configure
Firefox or Mozilla
1. Create a symbolic link to the libjavaplugin.so file in the browser plugins directory
* Go to the plugins sub-directory under the Firefox installation directory
cd /plugins
* Create the symbolic link
ln -s /plugin/i386/
ns7/libjavaplugin_oji.so
In the ln command line above, use ns7-gcc29 if Firefox was compiled with gcc2.9.
If you install Firefox 1.5 or later, you can enable the Java Console menu item in the Tools menu. Change directories to the Firefox extensions directory, then unzip ffjcext.zip there.
cd /usr/lib/firefox-1.4/extensions
unzip /usr/java/jre1.6.0/lib/deploy/ffjcext.zip
Example
* If Firefox is installed at this directory:
/usr/lib/firefox-1.4/
* And if the Java is installed at this directory:
/usr/java/jre1.6.0_20
* Then type in the terminal window to go to the browser plug-in directory:
cd /usr/lib/firefox-1.4/plugins
* Enter the following command to create a symbolic link to the Java Plug-in for the Mozilla browser.
ln -s /usr/java/jre1.6.0_20/plugin/i386/ns7/libjavaplugin_oji.so
2. Start the Firefox browser, or restart it if it is already up.
In Firefox, type about:plugins in the Location bar to confirm that the Java Plugin is loaded. If the version is Firefox 1.5 or later, click the Tools menu to confirm that Java Console is there
http://ubuntuforums.org/showthread.php?p=226828