Add StackEdit to any web site that supports Markdown
This extension will add a StackEdit button to all the textareas on GitHub and StackOverflow, which is the default configuration.
You can easily configure the extension to add the StackEdit button to any website you like, such as GitLab, Discourse or Redmine. You can also select the Markdown flavor to be used on each website (GFM, CommonMark...).