I installed adguard today (until now I have been using another standalone ad remover) and I find your application outstanding. I use KeePass password manager (http://keepass.info/) with Keefox Firefox addon (http://keefox.org/). Keefox is both Firefox and Keepas plugin, so its Firefox part communicates with Keepass part to get/set user name/passwords etc. When adguard is enabled Keefox cannot connect to Keepass. If I disable adguard temporarily it connects without any problems. I'm eager to help, I can provide any details you need to investigate the reason (even teamviewer remote session) If it works I'll buy the license immediately [EDIT] I found a solution. I just installed keefox experimental version (https://github.com/luckyrat/KeeFox/blob/master/XPI-package/latest.xpi?raw=true) which changed communication method and it works properly with ad guard!