Firefox 5 (Beta Channel) Ubuntu PPA

Firefox 5.0 beta 2 has been uploaded to the semi-official Firefox-Next Launchpad PPA for Ubuntu 11.04 Natty Narwhal and Ubuntu 10.10 Maverick Meerkat.
Firefox-Next PPA provides Firefox releases from the beta channel only, meaning you won't get highly unstable builds like the Mozilla Daily PPA. All new Firefox beta channel releases will be provided by this PPA, but with a delay because it takes some time to package new Firefox versions.