Firefox 23 is now completed after a few weeks testing and it has a new logo that while isn't a massive change, does make it much cleaner and modern. On desktop the new version includes a mixed content blocker that will prevent insecure content from being compromised. It also includes a built-in share option, a new network monitor for developers, more search provider options and many tweaks and bug fixes. You can download it right here.
An Android build has also been released today, however Mozilla has yet to provide any details on changes.