Problem with Drag and Drop in Firefox in Linux

Getting to be so specific as in the title took me a while...


System:
- Linux Debian
- Firefox and Chromium


Problem:
- If I drag and drop and image from Firefox into an Open Office document, I don't get the image but the html code of the image

example:

<img src="http://vignette4.wikia.nocookie.net/mrmen/images/5/52/Small.gif/revision/latest?cb=20100731114437" alt="http://vignette4.wikia.nocookie.net/mrmen/images/5/52/Small.gif/revision/latest?cb=20100731<img>


- If I drag and drop a URL from Firefox into an Open Office document, I don't get the link but the html code of the link


drag and drop and image from Firefox into an Open Office document, I don't get the image but the html code of the link

example:
<a href="http://www.w3schools.com/html/">Visit our HTML tutorial</a>



Research:

Initially I thought it was a problem with my Linux and after some tests I determined that:
- Chromium did not have that problem
- Drag and drop into Firefox seem not to be a problem either.

Ok, so the problem was Firefox.

I upgraded it. Problem persists.

Then I tested the firefox in safe mode. Problem persists.

Then I tested the firefox from a live-cd version of the same Linux distribution after updating Firefox. Problem persists.

Then I tested the "Firefox ESR" from a live-cd version of the same Linux distribution after updating "Firefox ESR". Problem does NOT happen.


So I went back to my initial linux, installed "Firefox ESR" and everything looks like in the original one, but without the drag and drop issue.

Problem resolved!



For the record:
- Firefox ESR 45.5.1
- Firefox 50.1.0  -> This is where the problem lies. Also on previous version.
- Chromium  53.0.2785.143 built on Debian stretch/sid, running on Debian stretch/sid (64-bit)