These extensions have been registered:
* Firefox: https://addons.mozilla.org/en-US/firefox/addon/disable-slack-wysiwyg/
* Chrome: https://chrome.google.com/webstore/detail/jenojkbpialbgpbgokiakifhpmoponjn
Based on the script by Kevin Fahy [1] and multiple discussions [2] [3] about Slack's new interface.
Let me know if you have any questions.
[1]: https://github.com/kfahy/slack-disable-wysiwyg-bookmarklet
[2]: https://news.ycombinator.com/item?id=21589647
[3]: https://news.ycombinator.com/item?id=21591950
