Macworld - With Firefox 5, Mozilla shifts to a faster release schedule, emulating the lightning pace at which Google's Chrome gains version numbers. Version 5 debuts mere months after Firefox 4, and Mozilla promises that future editions will arrive with similar speed.
But based on Firefox 5's paltry slate of notable new features, I'd say this swift increase in version numbers is mostly marketing. Firefox 4 represented a huge leap forward for the browser. Firefox 5? More like a small step or two.
Not much new, but still no slouch
In addition to security, stability, and other under-the-hood fixes, Firefox 5's release notes promise support for CSS animations, which Firefox 4 partly implemented. Alas, this feature remained half-baked for me. All the demos in Mozilla's documentation on CSS animation worked in my tests, but many demos I found on outside sites did not. Firefox 5 still doesn't seem to support the CSS 3D transforms used in some of CSS animation's niftier applications.
(Image Caption: Look alike: Can you spot the radical differences from Firefox 4? Neither can we.)
Mozilla also touts Firefox 5's improved WebGL code, which enables 3D graphics over the Web. Most WebGL demos I tested worked beautifully, even those built for Chrome, although one of the latter choked hard enough to briefly lock up my whole computer.
I also noted intermittent slowness when trying to scroll on certain pages with large or multiple Flash animated ads. On some sites, this presented a notable problem that Safari ( Macworld rated 4.5 out of 5 mice ) and other browsers lacked; on others with similarly complex design, Firefox 5 performed just fine.
Beyond that, Firefox 5 is, well, basically Firefox 4--a fast, responsive, fun browser with a few great ideas (like App Tabs) and a few uninspired ones (Tab Groups, I'm looking at you). I still enjoyed using Firefox 5 for daily browsing, and I still think it's a huge improvement on version 3, and a challenge to Apple to make Safari's next edition truly great.
On a 2GHz aluminum MacBook with 2GB RAM, Firefox 5 posted better benchmark scores than version 4 in some areas, but performed worse in others.
Firefox 5 also fulfilled Mozilla's promise of improved HTML5 support, scoring 286 points and 9 bonus points out of 450 in an online HTML5 compatibility test. Firefox 4 only managed 255 points and 9 bonus points. While Firefox 5 tied Opera's score here, and beat Safari's by more than 30 points, it lost to Chrome by nearly 40 points.
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