Unfortunately, this extension is unusable for me. It appears this extension does not play well with multiple tabs. I often have 100-200 tabs open at any given time. As soon as I scan the QR code to link the extension to my mobile app, all of my tabs refresh at once presumably because 2FAS is doing something in the background for each of them. My task manager shows that my CPU and memory skyrocket. Firefox went from using 765 MB of memory to over 3000 all at once. Firefox became completely unusable and unresponsive; it took a very long time for my inputs to even register closing all my windows and tabs so I could even get Firefox's extension manager to load so I could uninstall it. As soon as I did, Firefox functionality went back to normal and it had no problem with how many tabs I had open. I was excited to be able to use this extension so I could use 2-factor authentication on my browser directly, but looks like it's not in the cards with the way the extension is currently implemented.