The announcement comes after several months of beta tests. Mozilla is also working on versions for smartphones running Windows Mobile and Android.
Features of the mobile version of Firefox include tabbed browsing and what Mozilla calls Weave Sync, which synchronises a user's tabs, history, bookmarks and passwords between desktop and mobile browsers, according to a Mozilla blog announcing the release of the mobile browser.
Weave Sync is one of about 40 add-ons users can choose from. Others include an ad blocker and TwitterBar, which lets users post to Twitter from the address bar.
There is also an add-on for watching Youtube videos. Mozilla removed integrated support for Flash from the browser at the last minute because it degraded performance, Mozilla said in an earlier blog about the browser's release candidate on January 27.
Windows Mobile appears likely to be the next operating system supported by for Firefox Mobile. Owners of smartphones such as the Samsung Omnia II and HTC Touch Pro can try out the Alpha 3 version of the browser, according to Mozilla's mobile platform Wiki.
Mozilla is also in early development and testing of a version for the Android platform, the Wiki said.
However, owners of the iPhone or a Blackberry are out of luck.
Mozilla doesn't cite any technical problems with Symbian, but it still hasn't any current plans to develop its browser on that operating system.