30 May 2011, 18:22h UTC Downloaded 4.0 UK-edition on my laptop, the 4.0 US-edition on my desktop, and the 4.0 UK-edition on a 2nd laptop. On mine, updates to 4.0.1 are not found, some add-ons were taken off, as incompatible, that ran on the 4.0 on my desktop (and weren't on the 2nd laptop). Add-ons, now already even compatible with 4.0.1 (running on the 2nd laptop) will not run as 'incompatible' with 4.0 (though listed on the add-ons site as compatible. It has stopped telling me that 'something' is pretending to be an update from Firefox (whatever that 'something' be?) since setting the browser to updating manually, but asking me first what to do. All currently installed add-ons have not asked me for some time (though on other computers), and also report as fully up-t0-date. Ergo: Neither Firefox 4.0 nor any installed add-ons update correctly. --- Didn't crash, though it 'likes' doing that after printing (always Badly! with dreadful printing options/previews), leaving two tabs (rather than the one before), both of which only can be shut from their context menus. Crash reports have been sent with same email address, but not been answered. This browser has all the qualities of a Beta-release and needs some serious overhauls (it's also not very new or much safer!). Example for an add-on that won't install on 4.0, but will under 4.0.1: CookieMonster - which is desperately needed, given your browser still suffers from minimal, insufficient cookie management, incl. lists of domains that wish to set 'another' cookie when no cookies are as yet, allegedly, sitting on the computer.