We are still stuck with minimo_0.02+cvs20070626-r0_arm-oabi.ipk on the SIMpad, whereas development went on, and I've just seen an update to the latest version 1.8.1.16 for OpenBSD.Sources are to be found here.
Well, then we'll have to wait for Firefox Mobile (if it will be possible to squeeze it in for the Angstrom image). Strangely I could not find any useful info on Firefox Mobile.