Why doesn't babel-polyfill work in FireFox?

Question

JavaScript

Good day to all
There is an extension for chrome in it I use the package
...
import 'babel-polyfill'
...
Everything works.
There was a need to get this extension for FireFox. The error
`Unhandled promise rejection TypeError` began to fall: "promise.then" is not a function
Well, accordingly, all requests began to fall. If you comment out the connection, then the requests work, there are moments that have fallen off, in another place. But not the point.
Because of what it can fall in the mozilla?