I had to use their silly drag-and-drop email builder because I'm handing the email off to be edited by a non-dev. I dropped in a "Code" module so I could add some custom CSS but because a style tag generates no space, that module is no longer accessible via the UI as there's nothing to click on. So I thought oh brother I'll just inject a couple br tags via the Inspector and then poof, I'm in the doghouse.

https://sindresorhus.com/devtools-detect/

https://github.com/sindresorhus/devtools-detect

EDIT: doesn't seem to work if I have devtools as a separate window