Seems a good mix. If they do not slow down the browser. Why uninstall?
Oh. one there I do not like.
Bitdefender Quick Scan is an adware lurer, that is trying to lure users to go and install Bitdefender's av.
Take that off and install Bitdefender TrafficLight extension instead.
That is the one you should have in the browser.
DrWeb's is fine because it detects on avast!'s blind spots.
The rest are legit tracking blockers a good combination actually.
Bitdefender TrafficLight is an extension like Dr. Webs and WOT and is a pre-url checker,
so it delivers pre-check results for the url search results that your search engine query serves up on your search result page,
and then it blocks you from going to bad sites just like Google Safebrowsing does.
pol