Btw, it's interesting that the OP states that IE is the only browser where the Avast add-on works for him because in my case it will invariable crash my IE11 if I enable the add-on. I still have the AOS add-on installed in my FF browser, but then I've stopped version updates for FF as of version 40.0.3 because of post changes and don't really use FF anymore and instead have as of October switched to Pale Moon as my default browser and have never been happier as a result. I really appreciate the greater flexibility in as much as I prefer a more configurable browser which I've found the stability to be very robust and with far better support than I could ever get with the FF browser.