Extensions
Tampermonkey
Change the web at will with userscripts
Search image
Right-click on some text and find its image with Google image search.
Gismeteo
Gismeteo Weather Forecast. Real time weather and detailed forecast all round the world
RSS Zing
Notification for new RSS feed posts. No account required.
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.
Image Searcher
Search similar image by "Google search by Image".
Filter request headers
Block certain values (cookies, etc.) from http request headers.
iForum Opera
IPv4 to IPv6 Converter
Convert Internet Protocol v4 (IPv4) address to Internet Protocol v6 (IPv6) address using different methods.
UzHack - ответы к UzTest
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.
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
Feedly Notification
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
Classic Tabs brings back some of the extra tab options from Opera 12.
Linkify For Opera
Converts any plain text to clickable links
TweetRight +
Share web pages, selected text, links and images on Twitter by right click.
Gmail Notifier
Multiple label and account notifier for Google Mail (Gmail™)
Tawea
Opera Chat. Simple, personal.
WebMoney Advisor Next
Internet users feedback about the sites
Speed-Up Browsing
Speeds up browsing over the time, by adding missing Cache-Control response headers.
Magic Actions for YouTube™
Enhance your YouTube watching experience! Cinema Mode, Mouse Wheel Volume Control, AutoHD, Expand, Snapshots …
URLShortener
Shorten URLs and copy to clipboard or post to twitter directly. Goo.gl, Bit.ly, McAf.ee, Youtu.be Y.ahoo.it, and others.
Melanto Calculator
Easy to use scientific calculator ...
Print
Print the current page you see with one single click. That for all kinds of photo printing, poster printing, business cards, etc.
Fontstorage
The simplest extension for identifying and selecting fonts on a website.
Dark Skin for Youtube™
Makes Youtube go dark-side
Bitcoin ticker
This extension provides nice bitcoin ticker using Coindesk data.