Doesn't work "Scan still queued. Stopped polling. Please rescan later."

This only worked for me a few times after I first installed it. Now every time I try to check a link it says: "Scan still queued. Stopped polling. Please rescan later." I removed the addon and reinstalled it to no avail. I also visited the VirusTotal website to see if something there was causing my issue. I've tried all I can think to try.