Chrome has a good permissions model that i don't think can be much improved on. An ad-blocker needs access to data on every page you visit in order to do its job. I don't really see a way around it; Thats just how the web is constructed..
You can disable 3rd party scripts on your side (Firefox has Noscript addon for that; chrome should have something similar) but that may break the website you 're visiting
Workarounds : Disable add-ons in incognito mode, and conduct your important business there..
Or use a second chrome profile with no extensions for confidential stuff..