Plugin "Markdown Editing" will have command from this plugin:
http://www.macdrifter.com/2012/08/making-a-sublime-text-plugin-markdown-reference-viewer.html

done; plugin updated.

very nice idea and thanks for implementing…
will be possible to modify processing of references?
if _blabla_ is used inside list, it is not reference?
_[~blabla~]~(~url://blabla~_~"url"~)_
as secure version, not replaces…
right now - limited usage for me… but maybe enough for anyone else (^_^)
I cannot find Markdown docs about 'refs' , only found about 'footnotes' , it's not the same?
https://www.markdownguide.org/extended-syntax#footnotes
https://www.markdownguide.org/basic-syntax/#links
https://daringfireball.net/projects/markdown/syntax#link
footnote for me is _"link inside document"_, not link to web site… not to local file/folder (like _TOC links_ on Word/Writer document)
I have the feeling that mentioned references are _"external url references"_ (mentioned at plugin)
Todo
Plugin updated; seems OK now?
works fine, thanks