I've been using the Mozilla Daily PPA on Ubuntu which has had the Firefox 4 betas and I've been pleased with that is happening. It certainly seems nippier, Xmarks and Lastpass work really well with it and the "Pin as app tab" feature has really improved the way I use things like Gmail, Facebook and Zimbra. There's been a few crashes but I've put them down to it being in beta! Not tried their own sync thing. Jon On 28 March 2011 23:27, Adam Egan <adam.egan(a)gmail.com&gt; wrote: