[Eclipse plugin]MOZILLA_FIVE_HOME error

I've get an error everytime I try to change the settings for the
CheckStyle plugin in Eclipse:

Unhandled event loop exception
No more handles [Unknown Mozilla path (MOZILLA_FIVE_HOME not set)]

If I set MOZILLA_FIVE_HOME to /usr/lib/mozilla-firefox I get:

Unhandled event loop exception
XPCOM error -1041039104

I've got Eclipse Indigo, the last plugin version, and firefox 6.0.

Leonardo

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