A list of the most significant innovative features in the Opera browser. Features must have been unique for Opera (amongst web browsers) at some point to be listed.
Listed features should preferably include which year the feature was introduced in Opera, in which version and a short description. Things like "paste and go" are obviously no innovations.
Browsing many pages in one single window. This was one of the core features of the first version of Opera.
Multi-page, or tabbed browsing has become all the rage; with everyone and their pet Chihuahua getting in on the act.
Caching of pages and certain media in RAM instead of caching everything on disk.
Copied by NoTrax?.
Proportional full page scaling from 20% to 1000%.
Allows the user to save, open and insert sessions. A session includes the adress to all pages, the position of all windows, and how much the user have scrolled on the pages. Opera can autosave sessions and automatically restore them when starting Opera next time (even from a crash).
Copied by a Firefox extension and an IE shell(?).
Now built in to Firefox's core.
Aliases for search pages or bookmarks. E.g. "g icecream" to search on Google for Icecream.
UserCSS allows the user to manipulate the style of web pages by applying their own style sheets on top of the pages style. This is very useful for improving accessability, filtering content (ads), fixing broken web pages and for web developers.
Unknown if/when this feature was copied.
Handy tool used to easy delete private data of certain types (history, cookies, cache, ... ).
Duplicated in at least Firefox and a bunch of Internet Explorer shells.
Control your browser through mouse movements.
Nowadays available as extensions in Firefox and in Internet Explorer shells like Avant Browser.
Easily search Google or other search engines via a field in the browser interface.
Copied by most browsers including lots of browser extensions like Google Toolbar for Internet Explorer.
Block annoying Pop-up windows.
Improvements were made in Opera 6 and 7.
Displaying WWW sites on small screens in handheld devices.
In desktop version of Opera available since Opera 7.0.
Fast Forward will detect the most likely "next page" link and greatly simplify navigation in multi-page documents.
Now available as an Firefox extension.
Allows SHIFT+arrow keys to move the focus of links depending on their spatial position not the page structure. A great feature for navigating a page.
Firefox developers and evangelists have finally got round to realising its value, and seem rather excited over it.
Ability to fit a web page to browser window width and remove horizontal scrollbars.
Talk to your browser to navigate pages. A great feature for people with disabilities. Opera can also speak back the content of pages.
Actually, the GreaseMonkey plug-in existed for Firefox before UserJS was "publically" implemented in Opera (though the mechanism was there), but Opera's implementation was thought of independently. It is also more powerful and tightly integrated to Opera's core engine.
Operas became the first web browser to handle a peer-to-peer protocol when Opera 9 was released with built-in support for BitTorrent files. This is a logical addition to a browser which already supports HTTP and FTP downloads.
A platform for running widgets - small, chromeless programs - is included in Opera. This builds on its support for AJAX technologies.
A blank start page with a preview of preconfigured websites often visited