Hi again,
The problem with MicroB is the time it takes to load the first page after you start it. Sometimes it takes forever. Sometimes it just hangs at the loading animation and I have to kill it and open it again for it to work.
Another thing is that it is so outdated that it has many old security issues that were fixed in Firefox ages ago so one could pretty easily own your phone if he wants to.

@peterbjornx I'm pretty interested in your solution. Any ideas on how to build the desktop version of Firefox for maemo?