After recent Office 365 updates rich text editor was broken for FF & Chrome on app web.
Steps to reproduce:
1. Create an app with list.
2. Add a rich text field to the list (through the schema or UI after deployment)
3. Click on New Item
4. Place cursor on rich text aria - all rich editing buttons are grey out (looks like disabled), also script error thrown - "Uncaught TypeError: Cannot read property 'length' of null" in file ms.rte.js. Image below:
Have ever you experience this issue?