You will now see the web page getting replaced by the source code of the page. You can now start browsing through the code and see how the developers have created it. This feature does not allow you to edit the source code as this can lead to a lot of mischief.
Please make sure that you use this feature only for reference and respect the hard work that has been done by developers on the respective web pages. If you are using part of the source code for your web page, make sure you at least credit the original web page or developer as this is the proper practice. Stay ethical on the internet and make sure you do not indulge in malpractices.
If you do not have the Firefox browser and you want to give it a try, you can head to this link to download your copy.
