Summarize this article:

This is generally at the top of your browser window. The wording may vary on different browsers, but in general you'll see an option for both opening a New Tab and opening a New Window, so select whichever suits your needs. Then enter the URL you want to go to in the address bar and click Enter (Windows) or Return (Mac) to load the new web page.
Locate and click the File option in your browser menu. Select New Window. Wait for the new window/tab to load up.