What happens when I tap an NFC tag which contains a URL?
From trying it on two devices:

Galaxy S4 Google Play Edition: Lollipop 5.0, with multiple browsers. Once tagged the prompt to choose my browser comes up, and then once chosen opens the URL in the selected browser. The device was factory reset that morning. 

HTC M7: Stock 4.4 up to date, no reset done, one browser. Opened straight in the browser.