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Hi friends, in today's tutorial you'll learn what a User Agent Browser, how to use, how you change and when to change. I decided to make this tutorial for 5 Firefox browser has a problem when we want to we login on the Yahoo Mail account. We can do this if you use Firefox 5, we use new Yahoo Mail interface and if we mail account in Romanian.
What is a User Agent?
A mini application of the client / software used that allows the identification of the software version used, the operating system used, the version of the operating system and so on. When we use a browser and access a site, the browser's User Agent is queried and so the server, depending on the parameters set, can allow or deny us access to the desired service due to the old version of the browser or due to the operating system used. We all came across sites that did not allow us access to the Firefox browser and were notified that "to access the service use the Internet Explorer browser." Well, by manipulating the User Agent, we can trick sites into believing that we are using Internet Explorer, Opera or any other browser even though we are using Firefox.
When we change the User Agent is useful site?
As I said above, when you can not access some websites or web services only with certain browsers or browser versions. Also, using an iPhone or Android user agent, we can see how it looks on a smartphone websites, as they are displayed, depending very useful for web developers and web designers who want to optimize their website for mobile devices.
That said, I invite you to watch the video tutorial to see exactly how change Firefox's user agent as User Agent find out what we have and where we can download the new list of User Agent for different versions of browsers, operating systems or devices phones.

Link 4 Firefox user agent
Link user agent to see what we

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Adrian Burlugeanu.... linux.videotutorial.ro