We will be making an update available to Firefox 5 before the scheduled release of Firefox 6. This update will affect Macintosh users only. This update will fix two specific problems:
- There is a bug present in the upcoming release of OSX 10.7 that causes Firefox to crash when using downloadable fonts. Downloadable fonts are used widely on the web, so users would have suffered severe crash problems. We alerted Apple to the problem before the release of 10.7 but they did not fix the problem before 10.7 went to final release. We’ve changed the font APIs that we’re using to newer versions which appear to fix the problem. Users on 10.6 and before will continue to use the old APIs to reduce risk. Later versions of Firefox will move all 10.6 and later users to the new APIs.
- Apple recently updated Java on OSX 10.5 and it broke the Java plugin in Firefox. Although the number of people using Firefox on 10.5 is quite small, this update fixes Firefox so that it can load the Java plugin on 10.5.
We’ve moved to a train model for Firefox, which means that we make releases of Firefox every six weeks for both security and new features. Our model includes the capability to do minor updates for security or crash problems. This will be our first out-of-band update since the minor updates we did in between the release of Firefox 4 and Firefox 5.
People still running the Firefox 3.6 release of Firefox will also see an update. For 3.6 we will be disabling downloadable fonts for people running on OSX 10.7.
Firefox 3.6 users who upgrade to OSX 10.7 may also see scrollbar rendering issues. For people who see scrollbar issues, we encourage you to upgrade to Firefox 5.
This update will only affect users of OSX. Windows and Linux users should not see any updates.
Note: If you would like to help test these changes please try Firefox from our Aurora channel, which already contains these changes.