The addon can be loaded by the integrated addon manager. Afterwards it is located in %JD_HOME%/tools/jdownff.xpi
Or from this location. This version is compatible with Firefox 3.5.
Afterwards it is located in %JD_HOME%/tools/jdownff.xpi and must be opened with Firefox. ( Start Firefox → [File] → [Open] → %JD_HOME%/tools/jdownff.xpi and follow screen instructions )
Open this URL
For “Path to JDownloader” you have to enter the *.jar NOT the *.exe
Path to Java: /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
Path to JDownloader: /Applications/JDownloader.app/Contents/Resources/Java/JDownloader.jar
The Java path also applies to the multi-OS version of OS X!
Right-click on the Toolbar → [Customize …] opens a dialogue with all available buttons. Here you can drag the JD-button on the toolbar. This buttons sends all currently available links to JD.
Using this feature the addresses of all open tabs can be added to JD. If a Decrypter does not work, or none is available, this feature saves a lot of work.