多文件接口(MDI)、方便的缩放功能、整合搜索引擎、键盘截径与鼠标浏览功能、当机时下次可以从上次浏览进度开始、防止pop-up、Fullscreen、对HTML标准的支持、整合电子邮件与新闻群组以及让使用者自订接口按钮、skin、工具列等的排列方式，都是Opera多年来备受喜爱的特殊功能。对于对互联网技术有进一步研究的用户，Opera也是一个不可多得的好工具，包括HTML的标准验证、支持WML(WAP)、可以创建关连窗口、显示窗口尺寸等功能，对于设计网页的工作者助益很大。而Opera精心为视障用户设计的一系列功能，也是一个特点。另外值得一提的是，Opera除了在Windows外，也支持Linux、Mac等桌面操作系统，值得拭目以待。另外在欧美推出的Nokia 9210i当中，也内建的Opera在Symbian操作系统的浏览器，足见Opera在浏览器技术的实力。
Opera is known as the fastest and smallest full-featured browser, a first choice for people using older PCs and Windows 95 and a brilliant alternative to the default IE from Microsoft. This new version has a chance to actually beat IE hands-down because it has a truckload of new and exciting features. It complies to all the current web-page standards, it has a completely new interface (you can choose from single window and multi-window view), built-in search, a download manager, an advanced mail/news reader, print preview, a huge bookmark collection and much more in a 2Mb free package! Well, the free package also includes banner ads, but Opera is believed to be completely free of spyware, unlike some of its competitors. It’s lightning fast as well as stable and it looks gorgeous. It’s simply perfect! For a complete list of features check out the official website, there’s vastly more to discover.
Opera, first of all, is client World Wide Web, that is the program for extraction of the information from WWW as the documents created with help HyperText Markup Language (language of a marking of hypertext HTML).
Low requirements to resources of system. Opera will work even on 386 computer about 6 Mb of operative memory. MDI the interface. You can open without special expenses of memory any quantity of windows inside one working window, having chosen thus a tabulared or cascade mode.
Known issues:
• [BUG 284849] Yahoo! Mail beta may crash Opera.
• [BUG 286911] Flickr maps may crash Opera.
• Won't run correctly on Windows 95 or 98.
• Won't work correctly on Mac OS X 10.3.
• OS X version may cause persistent freezes on start-up.
• POP server cleaning has been disabled: When disabling the "Leave messages on server" option, existing messages on the server are not removed.
• [BUG 287170] On OS X, UI thumbnails have black backgrounds when using native skins.
• [BUG 184894] Native OS X UI elements cannot be used in skins.
• [BUG 280536] Opera on OS X will sometimes freeze when exiting Preferences.
• [BUG 286384] Yahoo mail is broken.
• [BUG 285741] Opera might freeze for a while when opening the feeds menu.
• [BUG 271585] The last directory used is not remembered in the Save As and Open dialogs.
• [BUG 264975] Graphical smilies do not work.
• [BUG 280261] Removing messages from filters does not work.
• [BUG 213115] Queued mail is sent at the next check, instead of waiting for manual action.
Changelog:
• [BUG 286186] There are no buttons in the customization dialog.
• [BUG 274352] Upgrading with no mail/RSS accounts causes a mail upgrade that never finishes.
• [BUG 255515] Chat should now work in Yahoo! Beta
• [BUG 281879] Show only cached images should now work properly
• [BUG 255304] Closing Speed Dial window fast after "delete private data" shouldn't crash Opera anymore
• [BUG 282598] Passwords set to "never for this server" can now be deleted again
• [BUG 286084] Content blocker works again
• [BUG 276354] Fixed bug where it was not possible to reconnect to mail server after disconnecting
• [BUG 262786] Onload handler in script no longer fired before onload attribute of body element
• [BUG 267384] JavaScript errors no longer reported as being in "Unknown thread"
• [BUG 233022] data: URIs are no longer considered off-site images
• Use 'Today' when a mail was sent today, even if it's in the future
UNIX-specific:
• Made flash animations work again
• [BUG 276704] [qt4] Focusing documents in other tabs now switches to that tab as expected
• [BUG 276959] [qt4] Tiling windows now works properly
Mac-specific:
• Fixed clipping of dialogs in Leopard
• Fixed font display in Leopard
• Smaller UI fonts
• Fixed issue selecting Opera.app icon
Windows-specific:
• Set default network from 128 back to 32. This might help with some stalling while loading pages on some systems
• Fixed appearance of fonts in Speed Dial configuration dialog and Widgets when using Cleartype
官网：http://www.opera.com
v9.50 Build 9562 Alpha For Windows(Classic Installer) - English
v9.50 Build 9562 Alpha For Windows(MSI Installer) - International