High DOM selection speed
Fast Start up
More of an internet suite than just a browser
Has slower load time
Has its own widgets – small web applications that start from within Opera.
Has a multiprocess architecture, protects your from having a bad Web page or application take your browser down.
Most secure browser
Supports WOFF, the Web Open Font Format.
Its password saving feature is not working properly on some websites.
Is not compatible with all websites
One product across platforms
User scripts which lets users change not only how a site looks, but also how it functions
Permanently enable private browsing.
Hardly any Cons
Browser installation changes your home page without asking.
Doesn't have the kind of security problems that plague IE on Windows
Built into the Operating System
No major new version has been released recently.
Didn't live up to its boast of being "the world's fastest web browser."
No way to customize your experience, not even skins
No developer tool
Only browser that works with Windows Updates via the web.
Speedy browser for high majority of sites.
No popup blocking for Win2k or XP SP1 users.
Very little development for standards- compliance and innovation.