~snip
From what it claims, it doesn't send any data, and it's stored locally, however, I don't see a reason to keep it anymore, nevertheless, it does look like a safety concern.
What is the name of the extension? I would like to dump the source code of of it to see if it sends data anywhere.
The name of the extension is Fea Keylogger, it mentions that it stores all data locally, or at least I hope it does. It'd be interesting to check if it's actually true or not, make sure to report back when you're done testing.