With plenty of competitors breathing down its neck--Microsoft's IE9 in particular--Mozilla is fixing the final bugs that lie in the way of a Firefox 4 release.

Last night, Mozilla released Firefox 4 beta 10 (click to download for Windows, Mac OS X, and Linux). This version focuses mostly on stability and performance rather than on new features--although one new option is the ability to start Firefox in safe mode by holding down shift when launching on Windows.

Flash should work better on Mac OS X with the new beta, and memory usage should be better, Mozilla said in a blog post yesterday.

Next up are one or two more beta versions, then the release candidates, and if all goes well, a final Firefox 4 release in February. In a planning message last night, release manager Christian Legnitto said Mozilla will build beta 11 and, if too many bugs remain unfixed, beta 12.

More: http://news.cnet.com/8301-30685_3-20029590-264.html

............................................................................................