How to setup Mozilla Firefox to use a proxy

Sometime we may need to connect to a web service that, for security reasons, accepts incoming connections only from specific hosts or IP addresses and our computer does not match any of those requirements.
The best way to connect to those services is to connect first to an intermediate computer that act as proxy to the target service we want to access.
To configure Mozilla Firefox to access a proxy, you first need to have the proxy details (you may request them to the Network Admin of the service you need to access):

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Enable the Quick Launch Bar on the taskbar of Windows 7

Now that the official support for Microsoft Windows XP is almost over, it is time for those people that still use it to upgrade to a new computer and since Windows 8.X has not been very popular in term of interface “upgrade”, Microsoft Windows 7 may be a good choice.
One feature that Windows XP had, but that Windows 7 does not longer offer by default is the “Quick Launch Bar”; technically it has been replaced by “Pin to taskbar”, but it does not provide the same “experience” to the user too used to the XP’s “Quick Launch Bar”.

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