Change the web at will with userscripts
Right-click on some text and find its image with Google image search.
Gismeteo Weather Forecast. Real time weather and detailed forecast all round the world
Styles and skins for all popular sites in the web
Notification for new RSS feed posts. No account required.
Nimbus Screen Capture
Screen Capture FULL Web page or any part. Edit screenshots. Record screencasts - record video from your screen.
W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
BuiltWith Technology Profiler
Find out what the website you are visiting is built with using this extension.
AutoPagerize load next page automatically in many web sites.
Search similar image by "Google search by Image".
Filter request headers
Block certain values (cookies, etc.) from http request headers.
The Old Reader extension
This extension provides a toolbar icon to notify you about unread items in your The Old Reader account.
IPv4 to IPv6 Converter
Convert Internet Protocol v4 (IPv4) address to Internet Protocol v6 (IPv6) address using different methods.
UzHack - ответы к UzTest
Base64 Encode and Decode
Quickly Encode & Decode Base64 strings
The Old Reader Notifier
Notifies you about unread items in your The Old Reader account.
Open in (background) tab
Extends the context menu of selected text to open an URL in a new tab.
Live HTTP Headers
Monitor all HTTP/HTTPs traffic from your browser.
Quickly view the HTTP headers of the current tab.
This extension lets you easy find the most common Opera actions.
Whats My Info
Shows your IP address and other useful info.
Pixiv image downloader
Slim Scroll bar
Modern & slim looks for browser scroll bars!
EX.UA/FS.UA без рекламы
Allows to disable the ad units: in the top, between the elements of the list, at the homepage, as well as on the search pages.
SG Fórum tuning
Notifier of unread articles for Feedly.
Shareaholic for Pinterest
Pin images from any website to Pinterest. See the official Pinterest pin count for any link.
Classic Tabs brings back some of the extra tab options from Opera 12.
IP Address and Domain Information
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
Linkify For Opera
Converts any plain text to clickable links
Share web pages, selected text, links and images on Twitter by right click.