What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

Mobile Edge Browser User Agent

Earl Hamilton
• Tuesday, 05 July, 2022
• 11 min read

Platform identifiers change based on the operating system being used, and version numbers also increment as time passes. Mapping UA string tokens to a more human-readable browser name for use in code is a common pattern on the web today.

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When mapping the new Edge token to a browser name, Microsoft recommends using a different name than the one developer used for the legacy version of Microsoft Edge to avoid accidentally applying any legacy workarounds that are not applicable to Chromium-based browsers. When Microsoft is notified about these types of issues, website owners are contacted and informed about the updated UA.

While all phones come with pre-installed browsers, both Google Play and Apple App Store offer a number of alternative browsers, some focusing on speed and lightness, others on saving bandwidth and blocking ads, and an ever-increasing amount claiming to increase privacy and reduce a users' mobile digital footprint. Feel free to browse the stats for your local market using our Data Explorer tool.

Optimize UX and conversion rate on mobile Boost web performance Target ads and analyze web traffic Enable App analytics and advertising insights You’ll also notice that the entire string ends with Edge /12.0, which Chrome does not.

There are ways to develop your website to progressively enhance itself based on the availability of features rather than by targeting specific browsers. Often, lazy developers will just sniff for the UA string and disable content on their website based on which browser they believe the viewer is using.

Internet Explorer 8 is a common point of frustration for developers, so they will frequently check if a user is using ANY version of IE, and disable features. The sergeant property has been aptly described as “an ever-growing pack of lies” by Patrick H. Lake in W3C discussions.

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(“or rather, a balancing act of adding enough legacy keywords that won’t immediately have old UA-sniffing code falling over, while still trying to convey a little of actually useful and accurate information.”) For example, the Modernize library is a fantastic and simple way of detecting features.

Over the past year, we’ve seen some UA-sniffing sites that have been updated to detect Microsoft Edge … only to provide it with a legacy IE11 code path. In our experience Microsoft Edge runs best on the ‘WebKit’ code paths in these sites.

The new Microsoft Edge web browser is based on Chromium, the same core that Google Chrome uses. It may identify as Chromium because of that and that should give it the same level of compatibility with websites and applications as Google Chrome.

One of the main motivations for doing so is Edge's improved support for media streaming sites like Netflix. Whereas Chrome users may play Netflix streams in a quality of up to 1080p (with some trickery offered by an extension, the default is 720p), Microsoft Edge classic users may enjoy streams in a quality up to 4K.

Bleeping Computer reports that the new Chromium-based Edge browser downloads a JSON file regularly from config. Edge may restrict exposure to one of the supported DRM plugins on select sites.

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It does so for CBS, Shudder, TV now, Bitcoin and Sling currently, and exposes only Google's Wide vine to these sites. Microsoft has not published any article or information on Edge's user agent changing capabilities.

Microsoft picks the classic Edge browser to unlock high quality streams on certain media streaming sites, Google Chrome when the user agent offers advantages, and the default user agent of the browser on the majority of sites out there. The Microsoft Edge DevTools provide a collection of features to help you emulate mobile devices.

Instead, you simulate the mobile user experience from your laptop or desktop. When in doubt, your best bet is to actually run your page on a mobile device.

You may view, change, debug, profile, or all four while you interact with the code. Choose Toggle device emulation () or choose To customize and control DevTools (...) > Device emulation to open the UI that enables you to simulate a mobile viewport.

By default, the Device Toolbar opens in Responsive Viewport Mode. To quickly test the look and feel of your page across multiple screen sizes, drag the handles to resize the viewport to your required dimensions.

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Choose a breakpoint to change the width of the viewport so that the media query gets triggered. The following table describes the differences between the available device type options.

OptionRendering methodCursor convents triggered Mobile Mobile Circle touch Mobile (no touch) Mobile NormalclickDesktopDesktopNormalclickDesktop (touch)DesktopCircletouchIf the Device Type list is not displayed, choose More options > Add device type. The Rotate button disappears if your Device Toolbar is narrow.

Mobile devices often have network and CPU constraints. Ensure you test how quickly your page loads and how it responds at different internet and CPU speeds.

Mid-tier mobile simulates fast 3G and throttles your CPU. All the throttling is based upon the normal capability of your laptop or desktop.

If the Throttle list is hidden, your Device Toolbar is too narrow. To access the Throttle list, increase the width of the Device Toolbar.

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To throttle the CPU only and not the network, complete the following steps. Or select Control + Shift + P (Windows, Linux) or Command + Shift + P (macOS) to open the Command Menu, type 3G, and choose To enable fast 3G throttling or Enable slow 3G throttling.

Choose To customize and control DevTools (...) > More tools > Sensors. Choose To customize and control DevTools (...) > More tools > Sensors.

If your page depends on the user agent string from a mobile device to render properly, use the Network conditions panel to provide different user agent strings. Choose To customize and control DevTools (...) > More tools > Network conditions.

Then, choose Custom... to select from a list of predefined user agent strings. Use the following options to discuss the new features and changes in the post, or anything else related to DevTools.

Send your feedback using the Send Feedback icon or select Alt + Shift + I (Windows, Linux) or Option + Shift + I (macOS) in DevTools. To file bugs about this article, use the following Feedback section.

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User's post on July 6, 2015, Hi but it is detected as chrome. It is set as default but when I go to webpage for detecting web browser it thinks it chrome.

In reply to patrickmulhall's post on July 9, 2015, Internet Explorer user agent show Firefox 11 please change Internet Explorer because should it show the i.e. user agent because that is not part of the new browser. Thanks for your feedback, it helps us improve the site.

Thanks for your feedback, it helps us improve the site. In reply to Girish Pattabiraman's post on February 9, 2016, I would also like to know if the MS EdgeUserAgent change can be made to persist so that I don't have to go into developer and set the Sergeant every time.

Mozilla/5.0 (Windows NT 10.0; Win64; x64) Apple WebKit/537.36 (HTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge /14.14295 “Note that we recommend avoiding user agent string detection if at all possible and sending Microsoft Edge the same content that you send other modern browsers.

PC: i7-6850k, AS Rock X99M Extreme 4, 16 GB DDR4, GTX 1060 6 GB CNB: Lenovo Yoga 710-14IKB Type 80V4Was this reply helpful? Thanks for your feedback, it helps us improve the site.

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It was working, then I installed a bunch of things, and not it is now. Thanks for your feedback, it helps us improve the site.

For others with weird agent strings, look at this registry entry. Thanks for your feedback, it helps us improve the site.

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