Great add-on. To make it work under Ubuntu, follow this answer on superuser.com (less than one minute of additional work):

https://superuser.com/a/1175837

As stated, you will need to do a small tweak for it to work on Ubuntu, but it's only a matter of seconds.

It just works. :-) Open a .md document and the document is rendered in Firefox. Don't want (or need) any more.

Сработало сразу и просто без доп. манипуляций с настройками.

This plugin could have a longer description, but its functionality is pretty good. I was looking for a GitHub styled MD renderer, that
* supports math too
* works with my files on my drive directly (file:// and without utf BOM).

It isn't as fast as I expected, but still does a good job.

Finally found this one working well in latest firefox 68. I'll continue to try it these days.
Thank you for your great job!

Great add-on!
If you cant open yout `.md` file on linux,
see this [question](https://superuser.com/questions/696361/how-to-get-the-markdown-viewer-addon-of-firefox-to-work-on-linux) .

Works for me.

On Linux, it required this manipulation with MIME database: https://superuser.com/a/1175837/60553

Install it and without having to configure anything your makdown file is rendered in Firefox's window!
Easy peasy ...

Simple and powerful. Latex Math support works pretty well.

Prise en charge d'unicode !