More browser extensions means more potential for conflicts, slowdowns and more UI clutter (assuming they have an interactive function like this one). Browser extensions getting hacked or bought and turned into malware is a concern. My adblocker is available for all browsers I use (and not just Chrome) and I know it's UI already - disabling a single block temporarily is done in 2 clicks.

That's why I'm skeptical of new browser extensions for things that the ones I have can already cover.

Doesn't mean everybody else has to feel like that (e.g. I honestly hadn't considered someone might want to install this but not a generic configurable blocker - even if you aren't aggressively blocking ads uBlock would be useful for me)