How To Manually Change User Agent Firefox Extension
Manually Change User Agent Firefox
Change User Agent Firefox

I have history turned off so images aren't cached for the New Tab Page and have to be reloaded when Firefox is restarted. Also, some of the sites that I have pinned are using HTTPS and wont allow their images to be cached. Oct 27, 2018 Change User Agent in Chrome without Extensions: First of all, Visit a webpage. Now, Go to Menu More Tools Developer Tools. Alternatively, You can right click on blank area of webpage and choose Inspect. Then, You should see a small mobile icon. Just click on it. Now, You can change devices according to your preferences.

Sometimes, add-ons and other installations can change your user agent without your knowledge. In any case, it's important to switch it back to the default user agent to display most websites correctly. To view your user agent, click the Firefox menu button, click Help and select Troubleshooting Information.
Jul 14, 2019 Once the download and installation of the add–on are complete, click on the User-Agent Switcher icon on the top right corner of Firefox and select the mobile device, browser, and the operating system to switch to the specific browser or user agent.

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A user agent is a line of code 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. Web developers might do this to see how their websites will appear on different versions of a browser. Sometimes, add-ons and other installations can change your user agent without your knowledge. In any case, it's important to switch it back to the default user agent to display most websites correctly.

To view your user agent, click the Firefox menu button , click Help and select Troubleshooting Information. This will open a page with the address about:support. The Application Basics section will include a User Agent entry. For example, the default user agent entry for Firefox 68 on Windows 7 (64-bit) would appear as:
_{Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0}

Note: If your user agent shows a previous Windows version, such as NT 6.0 (Windows Vista) instead of NT 6.1 (Windows 7), make sure you are not running Firefox in Compatibility mode. You can open the Properties of the Firefox desktop shortcut from the right-click context menu. Check the 'Compatibility' tab and make sure that all items are deselected in the 'Compatibility' tab of the Properties window.

To reset your user agent:

In the address bar, type about:config and press EnterReturn.
A warning page may appear. Click to continue to the about:config page.
Search for useragent by typing it into the Search field.
Right-clickHold down the control key while you click on each of these preferences, if they exist, and select Reset from the context menu.

In the address bar, type about:config and press EnterReturn.
A warning page may appear. Click to continue to the about:config page.
Search for useragent by typing it into the Search preference name field.
Click the Reset or Delete button on each of these preferences, if they exist:

How To Manually Change User Agent Firefox Extension

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

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

Manually Change User Agent Firefox

After resetting your user agent, you may need to clear your cookies and cache:

Click the Library button , click and select .
In the Time Range to clear: drop-down, select Everything.
Click the arrow next to Details to display the list of items that can be cleared.
Select both Cookies and Cache.
Click .

Change User Agent Firefox

Click the Library button , click and select .
In the Time Range to clear: drop-down, select Everything.
Below the drop-down menu, select both Cookies and Cache.
Click .