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Re:Markdown Here – Write email in Markdown by gknoy on Tuesday November 07, 2017 @03:03PM (#15646991)
I've used it for general composition (headings, bold text, etc), but its killer feature is for when you want to include a block of highlighted code. Markdown Here has fantastic support for GFM fenced code blocks.

I wish I could use it in Jira. :-(

Re:Markdown Here – Write email in Markdown by dtolb on Tuesday November 07, 2017 @03:46PM (#15647432)
I ran into the same issue and found https://chrome.google.com/webstore/detail/markdown-to-jira/j...

That converts markdown to Jira-markdown and back again. It's been fantastic for me.