Relative XPath Assistant per Francesco De Stefano

This WebExtension will give you the relative XPath expression of two web elements
See plugin in action -> https://youtu.be/6aOW9uAG_ok

Add-on is based on relative-xpath-helper open-source project on github [https://github.com/syamsasi99/relative-xpath-helper]

* It explores web elements with free XPath expression and press enter
* Finding out relative XPath expression of two html elements with just right click on the same elements

### Details
- Compared to the original version, some incompatibilities of the scripts with the Firefox browser have been improved and fixed
- No data is sent to any server and not get from any server

### Limitations
- WebExtension only works on sites that allow content scripts.
- Add-on does not search through view-source code of webpage.