Firefox 18 is currently slated to ship in final form the week of Jan. 7, 2013.
Other improvements in Firefox 18 highlighted by Mozilla included support for the "Retina" screens used by some Apple MacBook Pro notebooks, a browser-integrated PDF viewer, and an option that lets users disable insecure content -- that not protected by SSL, in other words -- found on HTTPS-secured sites.
That last feature has a possibly record-breaking history: According to Bugzilla, Mozilla's change- and bug-tracking database, work on insecure content disabling began almost 12 years ago, four years before Firefox 1.0 appeared.
"Way to go. I thought this might never land. And we beat the 12-year anniversary!" said Johnathan Nightingale, Mozilla's vice president of engineering, in a September 2012 message on the Bugzilla thread devoted to the feature.
The beta of Firefox 18 can be downloaded from Mozilla's website. Users who have been running earlier betas will be automatically updated to the new preview.
Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, or subscribe to Gregg's RSS feed . His e-mail address is firstname.lastname@example.org.
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