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

Firefox On Linux User Agent

Maria Johnson
• Friday, 30 July, 2021
• 11 min read

Mozilla/5.0 (platform ; RV: gecko version) Gecko/ gecko trail Firefox / firefoxversion Firefox OS phones say Mobile “; the web is the platform.

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Appname / app version indicates the application name and version. Firefoxversion will generally represent the equivalent Firefox release corresponding to the given Gecko version.

When Firefox runs on a device that has the phone form factor, there is a Mobile; token in the platform part of the UA string. The preferred way to target content to a device form factor is to use CSS Media Queries.

For increased interoperability, if the browser is running on a version below 4 it will report 4.4. Starting in Version 6, users can opt into using a GeckoView-based Focus for Android with a hidden preference: it uses a GeckoView UA string to advertise Gecko compatibility.

Klein Version (Rendering Engine) Sergeant string1.0 (Review)Mozilla/5.0 (Linux ; Android 7.0) Apple WebKit/537.36 (HTML, like Gecko) Version/4.0 Klein/1.0 Chrome/58.0.3029.83 Mobile Safari/537.364.1+ (Review)Mozilla/5.0 (Linux ; Android 7.0) Apple WebKit/537.36 (HTML, like Gecko) Version/4.0 Focus/4.1 Chrome/62.0.3029.83 Mobile Safari/537.366.0+ (GeckoView)Mozilla/5.0 (Android 7.0; Mobile; RV:62.0) Gecko/62.0 Firefox /62.0 Version 7 of Focus for iOS uses an user agent string with the following format: Note: this user agent was retrieved from an iPhone XR simulator and may be different on device.

Some of them we have noticed are of the form Nelson; “, Reopen; “, or Open C; (note that putting space is also discouraged). Firefox OS version numberGecko version number1.'s easy to find the correspondences by looking at the Mercurial repository names : repositories starting by mozilla-b2g are the release repositories for Firefox OS, and have both Firefox OS and Gecko versions in their names.


The first two digits are owned by the Mozilla product team and denote versions with new features (e.g.: v1.1, 1.2, etc). The third digit is incremented with regular version tags (about every 6 weeks) for security updates, and the fourth is owned by the OEM.

Identifier preferences, (see the obsolete Sergeant Strings Reference). In the past, specific plug-ins, add-ons or extensions added user agent parts to notify sites they were installed.

The recommended way to do this, if it's absolutely necessary (remember that it slows down every request) is to set a custom HTTP header. Firefox saves your personal information such as bookmarks, passwords, and user preferences in a set of files called your profile, which is stored in a separate location from the Firefox program files.

You can have multiple Firefox profiles, each containing a separate set of user information. Type about:profiles into the address bar and press the EnterReturn key.

The new profile will become the default and will be used the next time you start Firefox. Note: The folder containing the files for the profile is not renamed.

firefox agent user

Click this to make Firefox use this profile by default at startup. Click the Firefox menu at the top of the screen and select.

Click the Firefox menu and select. In the Run dialog box, type in: Firefox .exe -P You can use -P, -p or -ProfileManager (any of them should work).

You can have multiple Firefox programs installed in different locations. To start the Profile Manager for a specific Firefox installation, replace Firefox .exe in the above instructions with the full path to the Firefox program, enclose that line in quotes, then add a space followed by -P.

If the Profile Manager window still does not open, Firefox may have been running in the background, even though it was not visible. Close all instances of Firefox or restart the computer and then try again.

If you choose a folder that isn't empty and you later remove the profile and choose the “Delete Files” option, everything inside that folder will be deleted. “Don't Delete Files” is the preferred option because it saves the old profile's folder and allows you to recover the files to a new profile.

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Delete Files removes the profile and its files (including the profile bookmarks, settings, passwords, etc.). Note : The folder containing the files for the profile is not renamed.

If you check this option, Firefox will automatically load the selected profile at startup. If you uncheck this option, Firefox will show you the Profile Manager each time you start Firefox, so that you can select a profile to use.

When you first open Firefox in a new profile, a Welcome to Firefox page will open, with a space to enter your email address. Enter your email address and click Continue, to create or sign in to a Firefox Account.

You can then set up Sync for the new profile so that you can share the same bookmarks, browsing history, passwords and other user data with other Firefox profiles or devices. If you already use Sync in another profile or device, enter the email address and password for your Firefox account so that your new profile can use those settings.

Supported browsers:Internet Explorer, Safari, Chrome, Firefox, Opera, Edge, WebKit, Savant, Marathon, Aurora, Mozilla, Epiphany, Camino, Chimera, Chromium, Dragon, conker or, Conker or, Dillon, Links, Fire bird, Swift fox, Netscape, Flock, cab, Ice ape, icecap, Icecap, Weasel, Iron, Mellon, Conqueror, Landscape, Lynx, Marathon, minor, Minor, HTML, Mosaic, Netsuke, OneWeb, Tablet, Mini, Phoenix, Rocket, Safari, Browser, Monkey, Slim, WebKit, w3 m An user agent tells websites what type of browser and operating system you're using.

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This information helps the web server deliver content that's compatible with your browser. If websites tell you that your browser is outdated or incompatible even though Firefox is up to date, an incorrect user agent may be the cause.

This article explains how to fix problems with your Firefoxuseragent so that websites work properly. You can change Firefox's user agent to trick websites into thinking that you're using a different browser or operating system.

Websites may not display correctly or may show a message that your browser is outdated or incompatible, based on the detected user agent. It's important to switch Firefox back to the default user agent so that websites work properly.

The Application Basics section will show your current Firefox version and will include a Sergeant entry. You can open the Properties of the Firefox desktop shortcut from the right-click context menu.

Type about:config in the address bar and press Enter Return. Right-click Hold down the control key while you click on each of these preferences, if they exist, and select from the context menu.

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Type about:config in the address bar and press Enter Return. See Configuration Editor for Firefox for more information about using the about:config page to reset or delete preferences.

This page shows how to set or change curl command user agent. You can use curl command get headers or view source code of any website URL.

Another option is to use the about:config page typed in URL bar and set general.user agent.override. By changing user agent, sometimes, one can get access to restricted part of a website with extra contents that normally open only to bots, or search engine crawlers.

This kind of area typical example is “Member Only” forums or sites that don’t want to lose out on search engine traffic. Modification of user agent string also enable surfers to trick websites into believing that they are actually using a particular web browser or using specific system in order to avoid and disable advertising display or junk ads that targeted to specific segment of viewers of the websites only. Once installed and restarted Firefox, simply go to Tools Sergeant Switcher, and you will see a list of user agents which you can choose.

To change back to the default user agent, simply right-click on the line and select Reset. OK is a technology writer for Tech Journey with background of system and network administrator.

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The Chrome (or Chromium/Blink-based engines) user agent string is similar to Firefox ’s. For compatibility, it adds strings like HTML, like Gecko and Safari.

The Opera browser is also based on the Blink engine, which is why it almost looks the same, but adds “Or/”. In this example, the user agent string is mobile Safari’s version.

To do so, simply visit our project on the Debate hosted instance, create an account and either select an existing language or add a new one to get going. This way it becomes much easier for me to keep track of reported issues and get back to you if additional information is needed to help you.

And yes, the Browser data is here to stay and if you cannot cope with the extra size this causes please kindly download a different extension and don't down-vote.

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