I just got a job where I'll be spending the day behind a firewall. By night I'll carry my laptop home and do my meditations outside the firewall. I wrote the following scripts to avoid the hassle of setting my proxy preferences by hand twice a day: 
No proxy:

#!/bin/sh
perl -pi -e 's/^user_pref\("network\.proxy\.type".+$//' ~/.netscape/pr
+eferences.js
netscape&

Yes proxy (no perl!):

#!/bin/sh
echo 'user_pref("network.proxy.type", 1);' >> ~/.netscape/preferences.
+js
netscape&

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In reply to no proxy - yes proxy Netscape by gregorovius

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