The second beta is intended to gather additional feedback while delivering enhancements and bug fixes to the Beta 1 released in July.
The next stage will be the launch of a Release Candidate 1, which is scheduled for 19 September.
Other new features include a spell check for online forms such as those used for blogging services, and a facility to leave feedback.
The browser has fallen behind its original development schedule to be available by August. Mozilla expected a release by 24 October, but the project currently does not currently list a launch date.
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff