My problem: 1) open terminal 2) killall browser (no processes killed) 3) sudo gainroot (sometimes changes made in leafpad don't work unless I'm root) 4) leafpad /home/user/.mozilla/microb/prefs.js 5) user_pref("network.protocol-handler.warn-external.sip", false); user_pref("network.protocol-handler.warn-external.tel", false); ...copied at the bottom of the file. 6) Save 7) Turn off 8) Turn on 9) Check the file again through leafpad as root, changes there 10) Find a phone number in MicroB, not clickable 11) Check file again, changes lost Why are they not remaining?