In our Rails app we’re using a gem ‘letteropener’ which should open new tab with email message in the browser, when we’re in development env.
It works when we run the app on local machines, but it doesn’t, when we are running server through c9. The error message in the log looks like this:
I’ve described the problem with some more details here - https://github.com/ryanb/letter_opener/issues/124.
It there some c9 mechanism preventing new displays from being created?