Firefox 4 RC for mobile adds several new updates to its previous beta release, including faster scrolling, a more responsive version of Firefox Sync, text reformatting on zoom, a slimmed-down form helper and copy/paste functionality for HTML form fields. There are other UI changes, such as support for restartless add-ons, iframe scrolling and a redesign of the "New Tab Opened" popup.
Mozilla first released an alpha mobile browser last April. Back then it was called Fennec, not Firefox, and it was filled with bugs that would drain phone memory and crash the system on a regular basis. Mozilla has dramatically improved the product since then. The
Apparently Mozilla is so happy with the results since then that it is nearly ready for the mobile browser's official launch. In fact, the Firefox 4 RC is already available on the Android Marketplace and for download for Maemo. If no significant bugs are found by users of the release candidate, Mozilla will release the official version of Firefox for mobile soon.