Broken down, these objects mean: Mozilla/ Signifies the browser is Mozilla compatible. This string will vary depending on your operating system and the build number you are using. The full user agent string looks similar to this: For example, a developer channel release of Opera’s partner build with Yandex may have a signature that looks like:
This signifies the name of the browser (OPR) followed by a series of numbers denoting the build.Īn edition may be included in the string, if the build is from the developer or beta pre-release streams, or if the build has been custom-made for an Opera partner. The user agent string for Chromium-based versions of Opera resembles the Chrome string with an additional browser signature: Legacy version of Opera for Mac, Windows, and Linux can be found in the Opera archive.
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Opera highly recommends all users to update to the latest release. Opera downloads for Mac, Windows, and Linux platforms: Latest Opera features, security and stability release (final) For information about the landmarks developed in Opera’s Presto rendering engine and related Opera browsers, please see Opera’s archived version history.
The information below describes version history for Opera browsers built using the WebKit/Chromium rendering engine, Opera versions 15.0 and above. This document provides a quick historical reference to Opera versions, release dates, release streams, rendering engines, JavaScript engine, user agent/ID strings formats, features, and improvements.