How to build foxyproxy-x.x.xpi on Windows/Unix/Linux: For instruction on setting up a development environment, see how-to-setup-development-env.txt This project uses ant (http://ant.apache.org) to build its targets. Ant is a free, open-source, cross-platform java tool. No IDE is necessary, but if you want to use Eclipse (http://www.eclipse.org), an Eclipse .project file is included. You can either download ant from http://ant.apache.org/bindownload.cgi or download and install Eclipse. If you choose ant instead of Eclipse, ensure you also download a Java Development Environment (JDK) and set appropriate ant environment variables. Specifically, you might consider adding the ant script to your PATH variable and exporting the ANT_HOME environment variable. If you use Eclipse IDE, you neither have to download the JDK nor setup ant environment variables. You also need ant-optional JARs. For debian-based linux distributions, see http://packages.debian.org/lenny/ant-optional. Alternatively, just add ant-nodeps.jar to your CLASSPATH environment vairable. The ant build script is src/build.xml. The default target, named "build", builds the XPI in the directory ../targets. If you want to change this directory, change the value of the target-path property.Note that forward slashes are platform-independent in ant scripts; they work on both windows and *nix -- providing you have appropriate permissions on them.