The Line Wrap feature is now available in the desktop version of Google Chrome and Microsoft Edge browser. It provides you the ability to see the source code for any web page you want.

Open Firefox and navigate to the Facebook page you want to view. Click on the "Firefox" tab in the upper left corner of the screen, slide down to "Web Developer" and over to "View Page Source." ...

Being able to view source code directly in Safari is a much better experience than having to use a dedicated app that’s not your main browser. Once again, developers are still figuring out the best ...