What makes it better than Firefox or Opera?
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From my personal experience of Safari (which is based on konqueror), I find it a lot faster, more intuitive, and with a better and more accurate rendering engine than either Firefox or Opera.
When it comes to day-to-day browsing, it uses less system memory than firefox meaning I can do a lot more, a lot faster without page-swapping.
When it comes to development of webapps, I build for safari off the base, as its less quirky rendering means that my layout is accurate to web guidelines - I then just add the css quirks for other browsers afterwards.
I wouldnt be put off by these security issues in the long term - it was only 1.5 months ago that Firefox had similar issues. Speaking of which, make sure you have updated your firefox recently.
Just give it a whirl when it is released as stable, and see for yourself