This isn't a support forum but user to user help forum. You can search online on how to user a Browser as well.

This IS a Support Forum. Just search for "Support Forum" in the Search Support box and make sure Help Articles Only is selected. As you will see, there are a lot of articles about Support Forum.

Heck look at top where it says "Home / Support Forums / Firefox / ..."

I need to use tool such as a web browser properly and then we need support system

You need to be more clear on what you need help with so people can help you here.

For starters here is the Support articles for the desktop Firefox web browser. https://support.mozilla.org/en-US/products/firefox

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