- Download the JAR plugin somewhere.
- In Eclipse, File-> Import-> Plug-ins and Fragments
- Select the directory where you saved it, select "Projects with source folders", Next
- Add Plugin, Finish
You now have an Eclipse project representing the plugin. Make your changes, and then:
- File-> Export-> Deployable plugins and snippets
- Select a plugin, choose a place to save it.
I don’t know how to do the development on a plug-in that is live in your IDE instance, so I think you will need to install it on your copy of Eclipse, dropping it into the plugins directory, then restart.
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