Mozilla has uploaded the latest beta version of Firefox Mobile to the Android Market, making it much easier to download and install the mobile web browser. If you’ve been testing earlier builds of the browser, Mozilla recommends uninstalling them before installing the new version from the Market.
Firefox 4 beta for Android also adds better support for Android keyboards, support for uploading files through the browser, new Android-style menus, a save as PDF, function, and some bug fixes. Mozilla has added copy and paste functionality to the URL bar. It’s also easier to set up Firefox Sync to synchronize your bookmarks, open tabs, and other data with the desktop version of Firefox.
You can read about other changes in the release notes.