steps to develop firefox addon

[xerosanyam]

please add steps to use firebase in a firefox addon.

[jhuleatt]

This Stack Overflow answer may help.

[jhuleatt]

@xerosanyam are there any particular features you're looking for help with, or any problems you ran into? Or is this a more general feature request?

[xerosanyam]

this is a general request. It would be great if https://github.com/firebase/quickstart-js/tree/master/auth/chromextension is updated for web-extensions rather than chrome-only.