This new version of IceCat -- GNU version of the Mozilla Firefox browser, includes all changes made upstream in Firefox 3.6.2 plus some other small bug fixes.

"Happy GNU year! I am pleased to announce the new version of the GNU IceCat web browser. GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes the changes made in Firefox 3.0.5 ..."

After changing its stable release policy to a more accelerated pace, Mozilla released Firefox 5 pretty quick after the latest major Firefox version was put out. Firefox 4 was released on March 22, 2011 and this version follows only three months later. Here’s an announcement on the Mozilla Blog website.

"I am pleased to announce the new version of the GNU IceCat web browser. GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes all the changes made in Firefox 3.0.10 ..."

"I am pleased to announce the new version of the GNU IceCat web browser. GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes all the changes made in Firefox 3.0.9 ..."

"GNU IceCat 3.0.8-g1 has been released! GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes all the changes made in Firefox 3.0.8..." -- See also Free Addons for IceCat

"Hello! I am pleased to announce the new version of the GNU IceCat web browser. GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes the changes made in Firefox 3.0.4 ..." via info-gnu Archives

"...I wager that most of the technically-adept Mozilla community, who should be the first people to test new versions of the browser and file high quality bug reports, have a large set of addons they can't do without. And until those addons are available for Firefox 3.0b1, they won't be migrating - or will do so only for dedicated testing sessions, not every-day browsing..."

ftp://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk-l10n/

GNU IceCat is the GNU version of the Mozilla Firefox browser. This new version includes all changes made upstream in Firefox 3.6.9. Now the privacy extension gives an alert whenever an URL which starts with "javascript:" is typed in the address bar.