Install WWB core (and possibly WWB webMathematica), hit ok a couple of times
Don't forget to eventually adjust your location of Mathematica:
Here the About Eclipse box
And here the proof that it works:
One big productivity boost for me to use Eclipse is that there
are various vi plugins.
One free possibility to use is vrapper , another one (non-free) is viplugin
I also personally like this plugin which enables font-size changing by Crl++ and Ctrl+-
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