How to validate XPath using Firefox Web Developer Plugin?

Now it is possible to use xpath directly from the browser.

1. Open Web Developer tools by pressing F12
2. In the inspector there is a search bar at the top called Search HTML
3. Enter your xpath there and type ENTER

Now the inspector should be pointing to the element that was the outcome of evaluating the xpath. For example after evaluating //div[@id="notify-container"] the inspector is pointing to that div

I am using AutoPager extension on Firefox. It is quite handy for generate xpath and search xpath. you can refer to this post for more information: https://thachhoangautomation.wordpress.com/2017/10/11/generatesearch-cssselector-and-xpath-on-firefox-55-onward/