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.
A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".
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. By default, there is only a few user agents listed (depending on the versions), which can be Internet Explorer 6 / 7 / 8, Netscape, Opera, various search robots such as Google bot, Minot, Yahoo Slurp and iPhone 3.0.
The second method that you can modify the user agent in Firefox is by performing the following steps, which do not require any download: To change back to the default user agent, simply right-click on the line and select Reset.
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If you ever wanted to make your web traffic seem like it was coming from a different browser–say, to trick a site that claims it’s incompatible with yours–you can. This allows you to request web pages intended for different browsers–or even different devices, like smartphones and tablets.
Click the menu button to the right of the “Console” tab at the bottom of the Developer Tools pane and select “Network Conditions” If you don’t see the console at the bottom, click the menu button in the top right corner of the Developer Tools pane–that’s the button just to the left of the “x”–and select “Show Console”.
On the Network conditions tab, uncheck “Select automatically” next to User agent. It only works while you have the Developer Tools pane open, and it only applies to the current tab.
To create the preference, right-click on the about:config page, point to New, and select String. This setting applies to every open tab and persists until you change it, even if you close and reopen Firefox.
To revert Firefox to the default user agent, right-click the “general.user agent.override” preference and select Reset. Microsoft Edge and Internet Explorer have user agent switchers in their developer tools, and they’re nearly identical.
To open them, click the settings menu and select “F12 Developer Tools” or just press F12 on your keyboard. The developer tools will open in a separate pane at the bottom of the window.
You can find extensive lists of user agents on various websites, such as this one. It only applies to the current tab, and only while the F12 Developer Tools pane is open.
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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 changeFirefox'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.
If you can't resolve the problem this way, follow the steps below to reset the default user agent. 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. Type about:config in the address bar and press Enter Return.
Type about:config in the location (address) bar and press the Enter key to open the about:config page, just like you open a website by typing the URL in the location bar. If you see a warning message then you can confirm that you want to access the about:config page.
Use the Search bar at the top of the about:config page to locate preferences more easily preferences that have been modified and do not have the default value show as bold (user set) preferences that are user set (bold) can be reset to the default value via the right-click context menu preferences can be changed via the right-click context menu: Modify (String or Integer) or Toggle (Boolean) or by double-clicking the line with the pref preferences can be created via the right-click context menu: New String, Integer, Boolean That only affects the user agent as send via the HTTP request headers.
On the command line and select sergeant from the list that opens. On the command line and select sergeant from the list that opens.
Changing the user agent this way should also affect navigator.sergeant since Firefox 19 (bug #800157). Changing the user agent this way should also affect navigator.sergeant since Firefox 19 ().
You can create a new string pref on the about:config page. Type about:config in the location (address) bar and press the Enter key to open the about:config page, just like you open a website by typing the URL in the location bar.
*http://kb.mozillazine.org/about:config Type about:config in the location (address) bar and press the “Enter” key to open the about:config page, just like you open a website by typing the URL in the location bar. *If you see a warning message then you can confirm that you want to access the about:config page.
October 27, 2018, Most of the users don’t know what is user agent of a browser. So, There are a very few users who actually want to change their web browser’s user agent.
But, In short, An user agent is a software that provides information to a website about your browser, operating system, device etc. It helps a website to deliver compatible and relevant contents to its visitors.
Some websites deliver different contents for different operating systems, browsers and devices. In that case, You may feel necessity to change web browser’s user agent or operating system id to windows.
There are plenty of extensions or add-ons for all popular browsers to change its operating system, device and other information. You can simply install it in your browser (Chrome of Firefox) and then start using it.
After installing them, You should see a new icon in top right corner of browser. Click on that user agent extension icon and choose your preferences from browser versions, operating systems and device types etc.
You will see the different version of web pages according to the user agent you have selected In fact, Extensions and add-ons are the easiest way to changeuseragent.
ChangeUserAgent in Chrome without Extensions: First, Visit a webpage. Alternatively, You can right-click on blank area of webpage and choose To inspect.
You will find them by clicking on Edit from the device list of drop-down. Just, Right clicks on blank space and choose New > String.
A full list of user agents can be found here: udger.com/resources/ua-list You can set value according to your preference. If you want to get back the default user agent, Just right click on general.user agent.override preference and choose reset.
You can easily change, browser type, device, operating system information from there. You can change any web browser’s user agent using third-party extensions or manually.