G'day paulderdash - You may want to consider that what Adguard is doing is actually a MITM attack, and as such is introducing a security hole in your system. Avast--and almost all security software--is also doing it now.
The Adguard Certificate will actually replace whatever Site Certificate is supposed to be presented to your browser. Read
Security Week for more detail.
FWIW, I and many others disabled Avast WebShield for this reason, and I'm sure--with no research to back it up--that users of other AV systems have done the same. IMHO, no security system needs to fiddle with TLS which is our prime protection against MITM.
EDIT: Add reference.
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Understanding the scope of the problem is the first step on the path to true panic. [Florence Ambrose, "Freefall" 01372 January 22, 2007
http://freefall.purrsia.com/ff1400/fv01372.htm]
Edited 2 time(s). Last edit at 04/04/2017 11:34AM by gordon451.