I added this add-on to Firefox 61.0.1 and found that it caused my ability to access my bank's website, USAA, gone. After trying unsuccessfully to log on for 2 hours I tried another browser and had no problem. I then restarted with all add-ons disabled and found I was able to access USAA with no issues. Since I recently added Facebook Container I disabled it and restated Firefox and also had no issues with access to USAA. Facebook container appears to be of value but for me I cannot give up access to may financial accounts for it.