Not sure if it matters, but the microb modifications change some questionable things.

user_pref("general.useragent.locale", "en-GB");
user_pref("general.useragent.vendor", "Firefox/3.5 Maemo Browser 1.5.6 RX-51 N900");

The latter setting may cause problems in the OVI store if they are checking the version, I'm not sure, mine has:

user_pref("general.useragent.vendor", "Firefox/3.5 Maemo Browser 1.7.4.8 RX-51 N900");

I can't find a description of the below:
microb.suspend_javascript, mine has 2, the zip has 1.

Frank