There is no plugin needed. Calibre can convert from mobi/prc. You just have to make sure the file are not DRMed.
Calibre can manage DRMed ebooks but it can neither display their content nor convert them in any way.
If your ebooks are DRMed and you want to remove the DRM, goggle "apprentice alf". There you might find information that we can not discuss in this forum.
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