Why it zoom a site in or out, and how to change this back?

OK, here's the thing. I have a Dell laptop, and I use firefox all the time. But recently had a problem, it will zoom out on a site and will not go back! How can I get that back? I even tried going to the previous page and open a new tab for the site, but nothing does! and I think that's the place, but two of them now is arrived. SOMEONE PLEASE HELP?

See this:

https://support.Mozilla.com/en-us/KB/page+zoom

Tags: Firefox

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