Browser / Version: Firefox 57.0
Operating System: Mac OS X 10.12
Tested Another Browser: Yes
Problem type: Site is not usable
Description: In private browsing mode, Direct Message does not work.
Steps to Reproduce:
0. Open https://twitter.com/ in the private browsing window.
- Click "Messages" pane
- Direct Message in-content popup is shown, but there will not show the content with error message into the devtool's console: "TypeError: this.database is undefined
- Mysteriously, this is not reproduce always. Sometimes this works correctly.
From webcompat.com with