Hi, I'm a member of the mobile Firefox development team. Thanks for all the good feedback here!

Just to clear up the version numbers:

Firefox 4.0b1 for Maemo was released on October 7.

Firefox 4.0b2 for Maemo was released yesterday (November 4).

Firefox 4.0b3 will be released in around a month or two. Nightly builds are now versioned "4.0b3pre." Right now they are mostly the same as beta 2, because not much has changed yet. Each day there will be a new build with more changes as we work toward beta 3.