new Thunderbird 5 not new though but promising roadmap

Mozilla has released version 5 of Thunderbird, the popular open source e-mail client. The update includes some new features, updated components under the hood, and a number of performance and stability improvements.

Mozilla spun off Thunderbird in 2007, creating a separate organization called Mozilla Messaging. The split was reversed several months ago when Mozilla announced that it would reabsorb the messaging group and integrate it into Mozilla Labs.

faster: Firefox 5 now gets speedy (not SPDY)

From the 'But I Just Got Used to Firefox 4' files:

Firefox 5 is nearing completion and likely will be out next week. As opposed to Firefox 4 which introduced a new UI, tab panorama, jetpack, sync and apptabs, Firefox 5 sure does feel a bit 'light' on the big features side.

It does however have at least on amazing under the hood feature that will make Firefox 5 the fastest Mozilla browser ever. Unfortunately Mozilla's product people haven't chosen to productize the feature name but that doesn't make it any less important.