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

User Agent Opera

Danielle Fletcher
• Thursday, 29 October, 2020
• 12 min read

Changing the user agent string can be useful in certain scenarios when some website's functionality is locked down to the specific platform and you need to bypass the restriction. In today's article, we will learn how to change the user agent string in the popular Opera browser.

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This allows developers to differentiate various device classes like tablets, phones, Desktop PCs and laptops, and more. The user agent string can provide web servers some details about the user's operating system, and the browser version.

Prior to version 12, the browser had its own rendering engine, Presto, which was ditched in favor of Blink. Alternatively, you can enter a custom user agent value using the text box below the list.

The list includes various versions of Internet Explorer, Edge, Opera, Safari, Firefox, and Chrome. Using the built-in Developer Tools option, you can restore the default value of the user agent in the Opera browser any time.

The last row in the popup UI is dedicated for the control options including a button to change the UA to its default value. Moreover, you can specify a particular URL or domain so that UA is only applied to that URL or domain (read FAQ for detailed description)e. There is also a status-bar in the popup to show the current UA and other info as you move the mouse within the popup UI.f.

Default UA scan be modified from the toolbar panel UI (v.0.1.4) Android: a Google OS for various mobile devices including Nexus.3.

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Internet Explorer, Edge: two browsers build by Microsoft. Note 1: in order to report Bugs, please visit Add-on's Homepage ( and fill the Bug report form.

Built-in ad blocker battery saver free VPN This Opera extension adds a toolbar button and a menu to switch between user -agents.

It is possible to edit them with a hex editor if you know what you're doing, and the result would be a “patched opera .dll” file. I'm not aware that there are any suitably patched opera .dll files available anywhere however.

Unfortunately, the Opera developers started to experience strange problems with a selection of sites that use browser sniffing to serve version-specific content and/or scripts. Worse still, many of these sites decided that the browser was unsupported and refused to provide any content.

The Opera team deliberated the site compatibility problem and came up with the best compromise: freeze the first part of the string at 9.80 but append the real version number to the end. V9.80 was chosen rather than v.9.99 just in case there is a need to update the initial version number at a future date.

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These are used by web servers, primarily to ensure content is served correctly to the client accessing a specific service. User -agents are particularly crucial for mobile devices, which are much more fragmented than desktop computers in terms of capabilities.

Click Tools on the main toolbar and choose Quick Preferences. In the search box adjacent to Show All, type Spoof Sergeant ID.

This is the flag that was amended in the main guide, using the Opera graphical interface. Amend the current value to 1, 2, 3, 4 or 5 (refer to Step 3 of the main guide for descriptions): 1.

The Latest Opera features, security and stability release (final) Opera highly recommends all users to update to the latest release. They contain the latest changes, but may also have severe known issues, including crashes and data loss situations.

This string will vary depending on your operating system and the build number you are using. Chrome/ Signifies the browser is Chrome compatible.

opera agent change user window tools developer dot within corner icon three opens right

Or/ Signifies the Opera browser signature (See above). Discover when an Opera feature was first introduced into the WebKit/Chromium based browsers (in alphabetical order).

Next is FAQ, this section is useful to get information about how this add-on works in your browser. It is designed to collect user feedbacks and bugs about this add-on.

Users can suggest improvements or feature requests through this form too. The last section is dedicated to reports submitted through the GitHub website.

Toolbar popup UI provides an easy interface to access all 26 user agents. Clicking on any UA, will change your browsers user agent immediately.

Second row is for desktop user agents which includes Google Chrome, Opera, Firefox, Safari, MS Internet Explorer and the new Edge browser by Microsoft. The last row in the popup UI is dedicated for the control options including a button to change the UA to its default value.

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Moreover, some websites make look better in mobile devises while you are surfing in a desktop browser. With user agent switcher you have access to display a webpage or web element from a variety of different systems.

The process for changing user -agents on-the-fly after the extension is installed in your browser is an extremely simple task. In other words, user agent switcher can quickly switch between iOS, android, and other famous mobile devices.

We do NOT host any extensions/add-ons/plugins in our website, all the download links will direct you to the related Firefox, Google Chrome, Opera and Safari Add-on Stores. Simply open the toolbar-popup and click on the desired user agent, selected UA is marked with green border.

Windows Phone, which is a mobile OS from Microsoft for its windows-phone devices. This user agent is available in 4 different operating systems (windows, Linux, mac and chromes).

This user agent is available in 3 different operating systems (windows, Linux, mac). This user agent is available in 5 different operating systems (windows, Linux, mac, chromes, IBM Warp OS/2).

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This user agent is available in 3 different operating systems (windows, Linux, mac). To see your browsers user agent, you can use many websites that offer this service for Free.

But, if you do not want to completely remove this Add-on, you can simply open the toolbar popup, and click on the “Switch to Default” button in the bottom left corner. This way, your browsers user agent will be switched to its default value and no actions or changes will be made by this Add-on.

Once the UA is changed, click on the edit button in the bottom right corner in the popup. When you see the edit window opened, make your desired changes and click on the OK button.

Please note, before editing any user agent make sure the new value is a valid UA, otherwise the Add-on will not be able to change your browsers user agent and end up seeing errors in websites that you visit. If you want the selected user agent to be active on a specific website only, please open the toolbar-panel UI and enter the website address in designated field (input area in the bottom middle section).

In other words, if you do not modify the URL field, the UA will be applied to all websites and domains. In order to change the UA, the Add-on works in two separate modes.


Yes, it is fully compatible with all versions of modern browsers including, Firefox, Chrome and Opera. Please note, you can edit/update any of these strings from the toolbar popup UI once you run the Add-on in your browsers.

Malware: Houdini / Indoor / rat This one should pop right out in your logs. User _ agent matches “\<\|\>” Wireshark Filter: HTTP.

User _ agent matches “Windows\; U\; MSI 7\.0\; Windows NT 6\.0\; en-US” User _ agent matches “Windows NT 6\.1\; wow64\; RV\:25\.0” & HTTP.

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08: Firefox Change User Agent Addon
09: Firefox Change User Agent Opera
10: Firefox Extension Change User Agent
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