Paste fails on Firefox

I'm using firefox browser to develop an app using react-terminal. When I try to paste data into the terminal with Ctrl-V, nothing happens in the terminal. In the web console I see this error:

```
TypeError: navigator.clipboard.readText is not a function
    f index.es.js:1
    h index.es.js:1
    React 24
    js index.js:14
    factory react refresh:6
    Webpack 3
```