This is my personal review so I will go with my own opinions, however Firefox 3.5 is a bit faster than the earlier versions, even with Firefox 3.5 they have not learnt a lot of things they should have learnt, several things that matter in user experience have been left out, and several things including tab management which people install as add-ons but never use have been incorporated.
Microsoft’s marketing campaigns sometimes do not make any sense at all, however here is another campaign they have undertaken to promote IE8, with this competition they aim to grow their market share in the browser wars.
Remember v3.0.187.1 is a dev channel so don’t download it unless you have been using the dev channel for Chrome.
If you are using the dev channel for Google Chrome do not download or update the browser to v3.0.187.0, this version is very unstable and crashes the browser whenever you visit the menu item.