Fast. Highly compliant with new Web standards. Tons of helpful features.
Built-in mail client. Cross platform. Now with extensions.
Extension gallery not as extensive as Firefox's or Chrome's.
Some sites display a message saying the browser isn't supported.
Process Isolated Tabs and Add-Ons – this adds stability to the browser in case a particular plugin or a page goes rogue. Also, since each tab is its own process, overall security should be better.
Lack of Add-Ons – this is the single biggest problem with Chrome and why people just look at it, say “Nice!”, and never run it again after that. For example, it doesn’t have a StumbleUpon toolbar, or AdBlock, or S3Fox, or any number of add-ons and extensions that people have come to depend on.
Privacy Concerns – It’s from Google – most users are vary of the Terms of Service which Google has (and for Chrome these have been revised, but are not much better). There is very little trust, when it comes to Google tracking user data, and from Chrome, it has a license to track everywhere you go. The German Government has actually warned the citizens against using Chrome.
Reader view hides webpage clutter. Cover flow and other beautiful interface elements
No extensions available yet.
Firefox 4 is in on its one-millionth beta (just kidding, it's on beta 11), rocking its own online tracking opt-out mechanism, an updated interface, and WebGL hardware acceleration.
Slow start up
pluggins can still be malicious
Improved tab function. Many security features. Tracking Protection. Improved standards support. Pinned tabs make sites like apps in Windows 7.
Wonky color coding
Some instability and site misrendering.
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