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A user agent tells websites what type of browser and operating organisation y'all're using. This information helps the web server evangelize content that's compatible with your browser. If websites tell you that your browser is outdated or incompatible even though Firefox is upwards to date, an wrong user agent may be the cause. This commodity explains how to fix problems with your Firefox user agent and then that websites piece of work properly.

User amanuensis issues

You tin can alter Firefox's user amanuensis to play a joke on websites into thinking that you're using a different browser or operating system. Web developers might do this to encounter how their websites volition appear on different systems and browsers. Sometimes, add-ons and other installations tin change your user agent without your knowledge.

Websites may not brandish correctly or may testify a message that your browser is outdated or incompatible, based on the detected user amanuensis. It'southward important to switch Firefox dorsum to the default user agent so that websites work properly.

View your user agent

To view your user agent, click the Firefox menu button Fx57Menu , click and select . This will open a page with the address about:support. The Awarding Basics section will prove your current Firefox version and will include a User Amanuensis entry. For example, the default user agent entry for Firefox 83 on Windows 10 (64-bit) would appear as:
_{Mozilla/five.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0}

Annotation: If your user agent shows a previous Windows version, such equally Windows NT half-dozen.1 (Windows vii) instead of Windows NT 10.0 (Windows 10), make sure y'all are not running Firefox in Compatibility fashion. You can open the Properties of the Firefox desktop shortcut from the correct-click context menu. Cheque the "Compatibility" tab and make certain that the compatibility manner option is not selected.

Sites such as What is my user agent? - WhatIsMyBrowser.com and What'southward my user amanuensis? - whatsmyua.info can as well bear witness you the user agent detected by websites.

Improver bug

Add-ons such every bit the User-Agent Switcher extension can change the user agent that websites detect. Run into if you lot tin restore the default user amanuensis in your extension settings. You can likewise temporarily restart Firefox with all add-ons disabled (encounter Diagnose Firefox issues using Troubleshoot Manner for details) and, if the trouble goes away, disable or remove any add-on you think may exist the cause. If you can't resolve the problem this mode, follow the steps below to reset the default user agent.

Reset the default Firefox user agent

You can reset your user agent as follows:

Blazon about:config in the address bar and press Enter Render .
A alert page may appear. Click Accept the Risk and Continue to go to the well-nigh:config page.
Search for useragent by typing information technology into the Search preference proper name field.
Click the Reset or Delete push button on each of these preferences, if they exist:

general.useragent.extra.firefox
general.useragent.extra.productName – where productName can exist the name of some 3rd party software (e.one thousand. microsoftdotnet).
general.useragent.locale
general.useragent.override
full general.useragent.security

See Configuration Editor for Firefox for more information most using the most:config page to reset or delete preferences.

Note: If the above solution doesn't resolve the problem, check whether you have the privacy.resistFingerprinting preference gear up to true and, if and so, double-click on the preference to reset information technology to false. This setting can change the user amanuensis and cause this type of issue. For more information, meet Firefox's protection against fingerprinting.

After resetting your user agent, yous may need to restart Firefox and clear your cookies and cache:

Click on the menu button to open the menu panel. Click the Library push on your toolbar. (If you don't see it, click the menu push button, and then click click the carte button.)
Click and select .
In the Fourth dimension Range to articulate: drop-down, select Everything.
Below the drib-downwardly carte, select both Cookies and Enshroud. Make sure other items you want to go along are non selected.
Click OK.