Feedbro is compromised. It is communicating with a malicious IP: 50.87.175.165 According to AbuseIPDB this is for a word press brute force attack. It will slow up your internet browsing and it was making Google give me the "Are you a human" pop up when they get suspicious usage from a single device. I turned it off and the popups stopped. The only feeds I was tracking were a few people's tumblr pages. I had to ask around on forums at first because I legit thought I had a virus until I disabled the extension and no regular virus scanner was picking this up (by nature of how extensions work.)

Edit: I had ONE RSS feed I forgot about that wasn't a tumblr and must have been powered by wordpress (the feed author had a WP site.) Feedbro doesn't have anything in place to deal with broken feed requests. I had no way of knowing.