How do I find an app to tweet? The apps listed do not work after update.

I updated Firefox to version 55.0.03. The app listed to tweet "share on twitter" does not work at all. I have tried to add again several times and it says the app has been added but the icon does not show up. I have restarted Firefox several times and no luck. How can I tweet? I am now using Chrome until I have this fixed.