How to reset the default user agent on Firefox
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- Revision id: 63381
- Created:
- Creator: Joni
- Comment: first draft
- Reviewed: No
- Ready for localization: No
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A user agent is a line of text that tells websites what type of browser and operating system you're using. This information helps the web server deliver content that's compatible with your browser.
You can change Firefox's user agent to trick outdated websites into thinking that you're using a different version of the browser, but it's important to switch it back to the default user agent to display most websites correctly. Sometimes, add-ons and other installations can change your user agent without your knowledge. In both cases, you need to set Firefox back to your default user agent.
To reset your user agent:
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to go to the about:config page. - Search for useragent by typing it into the FilterSearch field.
- Right-clickHold down the control key while you click on each of these preferences, if they exist, and select from the context menu.
- general.useragent.extra.firefox
- general.useragent.extra.productName - where productName can be the name of some third party software (e.g. microsoftdotnet).
- general.useragent.locale
- general.useragent.override
- general.useragent.security
After resetting your user agent, you may need to clear your cookies and cache:
- Click the menu button to open the menu panel.
- Click and select
- In the Time Range to clear: drop-down, select Everything.
- Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
- Click .