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Using Firefox "Modify Headers" Add-on to change your browser's "User-Agent" attribute in HTTP header

Using Firefox "Modify Headers" Add-on to change your browser's "User-Agent" attribute in http header

To install the "modify Headers" add on, go to the following url:
https://addons.mozilla.org/en-US/firefox/addon/967/
Then click "continue to download" and follow the steps. At the end it will ask you to restart Firefox.

Once the add-on is active, go to Tools->Modify Headers.

In the new popped up window, select Add in the first select box. Next box will define the attribute name (User-Agent) and the following after that, will define the value ("SonyEricsson e800"). The last box defines your comment and, probably, is optional.

To make use of this attribute in the header of all http requests sent by your Firefox, click "Configuration" and "Always ON".

After this, all http requests will look like this:

(Above request goes through a proxy, of course).

I prefer the Header tool plugin https://addons.mozilla.org/en-US/firefox/addon/271768/ https://addons.mozilla.org/en-US/firefox/addon/271768/ is more affordable and quicker to edit and restore. It also support the js code modification so you can easy modify the header content or the value with javascript. as example you can encode in base 64 easily the content of a header

Would the same process apply in I.E if not then are there any free tutorials on how to do that? Thanks in advance!

In the new window pops up, select Add from the first selection box. Following box will set the name attribute (User-Agent) and after that will set the value ("SonyEricsson e800"). The last box that defines your comment and, probably, is optional.

In the new window pops up, select Add from the first selection box. Following box will set the name attribute (User-Agent) and after that will set the value ("SonyEricsson e800"). The last box that defines your comment and, probably, is optional.

The HTTP-EQUIV attribute can be used instead of the NAME attribute to indicate that the property is an HTTP header. Some servers send the HTTP header specified in the META element, and browsers often recognize the header, even when it is sent by the server.

Is there any pluging like this for google chrome. I want to visit mobile sites through Google chrome.

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Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.