On Linux, Mozilla requires JRE 1.4.2 or later.
Mozilla 1.4 and later, and Mozilla Firebird, are compiled with gcc 3.2.3. A gcc 3.x compatible version of the Java plugin must be used. JRE 1.4.2 contains a compatible plugin.
If you installed the JRE 1.4.2_02 RPM, this plugin is /usr/java/j2re1.4.2_02/plugin/i386/ns610-gcc32/libjavaplugin_oji.so - and to install it for Mozilla (including Mozilla Firebird), do the following:
* Open a terminal
* Change to your Mozilla (or Mozilla Firebird) plugins directory
* Issue the following command: ln -s /usr/java/j2re1.4.2_02/plugin/i386/ns610-gcc32/libjavaplugin_oji.so
If you are using an older Linux distribution, you may need to install the gcc3 support libraries, as the gcc 3.2 version of the Java plugin requires libgcc_s.so.1 to operate. You may be able to find packages using Google.
If you are using an old or unofficial build of Mozilla (1.4a or later) or Mozilla Firebird, you can check which compiler was used by entering about
:buildconfig in the location bar and pressing enter. You will see a line such as "gcc version 3.3 20030226 (prerelease) (SuSE Linux)", which will show the compiler that was used. If gcc2.9x was used, you need to use the ns610 plugin, not the ns610-gcc32 plugin. " (http://plugindoc.mozdev.org/faqs/java.html#Linux