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?