A good way to test Firefox 3 without having to install it over your precious Firefox 2 client is to download and run the Firefox 3 portable version which comes with all features of Firefox 3 but does not tamper with previous versions of Firefox in any way. The portable client uses its own profile [...]
There are several ways that allow you to test Firefox 3 without interfering with Firefox 2 if that browser is also installed on your system. If you simply install the regular Firefox 3 version it will use the same profile folder which means that it will check all add-ons for compatibility and Firefox 2 will [...]
