Can share some of your strong tweaks with KIS?
Talking of privacy. I'm using a VPN, the following FF extensions with enhanced privacy flag settings and those provided by KIS for browser protection eg phishing/scam/malicious sites, PUPs, HTTPS Scanning etc. I believe they should be more than what AdGuard can offer. One good thing I see of Adguard is that I can see what software is phoning home which I can block without going through the net. I think BlackFog Privacy also has this feature while the other features are already present in KIS
uBO with filters in Hard Mode
I don't care About Cookies
CSS Exfil Protection
Privacy-Oriented Origin Policy
User-Agent Switcher and Manager
Note :- The reasons why so many extensions are used is because, through testing, some have duplicate or ineffective features which I disabled while some needs to be combined to have effective blocking and others are to cater to shortfall in FF itself. Notice some extensions have features to prevent fingerprinting as well.
Later when FF implements surfing https-only sites in its future build the Smart HTTPS extension can, hopefully, be removed.
Do your browsers even work with all that crap in them?