Well, you could keep it a one-liner and call exec to run netscape, still taking advantage of the cool -pi options: 
perl -pi -e 's/^user_pref\("network\.proxy\.type".+$//; END{exec netsc
+ape}' ~/.netscape/preferences.js

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In reply to RE: RE: no proxy - yes proxy Netscape by gregorovius
in thread no proxy - yes proxy Netscape by gregorovius

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