I have 32 gb of RAM, but whenever i closed or opened new tabs firefox started to take up to 24 gb (out of all available) and then crash, also tabs that normally take milliseconds to load taken more than 10 seconds, uninstalling this extension resolved the problem. It strange that this extension would need so much RAM even if it's collecting your data when it's inactive, and it's certainly shouldn't impact anything when you don't activate it.