Markdown to JIRA is just a tiny wrapper around j2m http://j2m.fokkezb.nl/, a javascript library that converts Markdown to JIRA markup (and the other way around) that does all the work.
It's inspired by the much more powerful Markdown Here http://markdown-here.com/ extension, that converts Markdown to HTML (I use it for Gmail).
This extension adds an entry to your right-click menu, called JIRA Formatting that expands further in 2 entries:
- MD to JIRA
- JIRA to MD
When you right click on an issue page on JIRA, and select one of the 2 functionalities, the extension will replace the content with the equivalent markup.
The addon has been tested on the following domains:
- *.jboss.org
- *.apache.org
- *.jira.com
- *.atlassian.com
But you can define in preferences on which domain you want it to be enabled.

- License: MIT License
- Weekly downloads: 3
- Average daily users: 93
- Rating: 3.3333/5 of 3 ratings
- Created: 2016-07-20 13:09:17
- Last updated: 2017-12-19 10:40:07
- Homepage: https://github.com/paoloantinori/markdown_to_jira
- Support site and email
- Orig: https://addons.mozilla.org/en-US/firefox/addon/markdown-to-jira/
- API: @markdown_to_jira