Type the following into the address bar:

javascript: alert(15+2-5);


You can replace the number accordingly.
...

A easy way to find keywords in firefox is to press Ctrl + F

A bar will pop in at the bottom of the screen you can easily find keywords.

oh... cool.

Go to Start -> Run
then type the following:

ping www.google.com -t

You can try out other websites, too.

I just found another way to do it, try this:

Go to Control Panel -> Network Connections
-> Right-click on your Dial-up or ADSL connection -> Properties
-> Networking
-> Uninstall QoS Packet...

Windows uses 20% of your bandwidth Here's how to Get it back:

Microsoft reserve 20% of your available bandwidth for their own purposes (suspect for updates and interrogating your machine etc..)
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Wanted to Browse fast in windows. Remember these commands.
This will really save a lot of time of your. There are many
commands which you might have never seen or never knew.
There are certain...