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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
The firebase js file is 360kB, and most Espruino devices have in the region of 50kB available RAM, so there's no way you can use the lib directly. It sounds like you might be trying to use just a bare ESP8266? In that case you'll have even less memory available.
Potentially you could try to use tree-shaking tools to strip out the bits you're not using, but I think this is more effort that doing it directly, and you're very unlikely to get it small enough that you could run other code as well.