Extensions - Add-ons With Opera switching from Presto to Chromium and a complete UI remake, our extensions infrastructure has also gotten a major overhaul: from Opera 15 onward, Opera 11 & 12’s extension format is no longer supported, and instead, we’ve switched to Chromium’s extension model. Check out our new documentation for developing extensions for Opera 15 and higher and start building your own extensions. Getting started API reference You can build Opera extensions using the Opera Extensions APIs and open web standards like JavaScript and HTML. Basics and UI elements: Browser functions: Injected scripts (add JavaScript to websites) URL filtering (e.g. for ad blocking) Messaging (e.g. between the background process and the injected script) Speed Dial (for Speed Dial extensions) Resource Loader (access any file within an extension package) Screenshot (take screenshots of pages) Context Menu (add items to the context menu) Finishing up: Extension tutorials Templates and code samples
developer console bookmarklet By Opera Software Note: this bookmarklet is no longer supported, and only here for historical reference. Instead, we recommend you try out our powerful Opera Dragonfly – Opera's built-in web developer tools. There is also an extensive Opera Dragonfly documentation for your reference. This bookmarklet has been used by Web Application developers at Opera Software for some time. All of the tools should work in Opera 9.0 and later. Installing developer console Drag the developer console button directly to any Opera toolbar. Opera Developer Console Opera now includes a developer console that can be added into the browser with many new features. To install this tool, drag it into any Opera toolbar: To learn more, look through the documentation below. DOM Snapshot The DOM Snapshot tool allows you to inspect the source of a page, as parsed by the browser. Using the Opera Developer Console Opening the Developer Console Console basics DOM Inspection The node tree Selecting nodes in the node tree Removing nodes
Desktop Team - Desktop Team We’re bringing your gaming style to your phone Great news gamers! Today, we’re releasing the beta version of Opera GX Mobile – the world’s first mobile browser designed specifically for you. The concept has been one of the most frequent requests we’ve got from you since releasing Opera GX – our successful desktop browser used... » Read more Opera is the only browser to natively support Unstoppable Domains and Web3 on Windows, Mac and Linux, as well as Android and iOS Hi there, We have some great news for all the crypto enthusiasts out there! » Read more Hello there, this is the weekly Developer update. » Read more Hello one and all! » Read more Hello once again, For a good start to a new week, we’ve got a fresh Opera 78 developer update for you. » Read more Hello, Hope everyone is doing well! » Read more Hello, This is Opera 76 Stable update. » Read more Hello. » Read more Hello there, We are updating Opera 77 today.
Dragonfly – Opera's built-in web developer tools Fast, lean and powerful. Meet Opera Dragonfly — our fully-featured suite of developer tools, designed to make your job easier. It’s just a right-click away. No install required. Built-in Opera Dragonfly is built right into the browser and updates automatically behind the scenes. Fully loaded A full suite of tools puts you in control. Cross-device Develop for mobile, tablet or TV?