Aside from having found the problem with HTTPS scanning - are you also going to fix the UI where XP users don’t have HTTPS scanning options.

Currently I tried a fix from Lukas: https://forum.avast.com/index.php?topic=172470.msg1224686#msg1224686
WebShield.ini

[WebScanner]
HttpsScanning=0

This however doesn’t stop HTTPS scanning in XP, Firefox 38.0.5, nor does it change the user interface.