> Add-ons like those should scare you because they give a small third party free access to every web site you visit.
I think that they should scare you because they're, not surreptitiously but by design, consenting to innumerable requests to share your data without your interaction; but I guess to each their own scariness.
With auto updates, you can't even verify that it isn't doing anything unwanted just once.
It could easily make sense to the developer to one day sell to someone who wants to do bad things which is commonly what happens with these.
I wish this wasn't true because add-ons like these are powerful and required for the modern web.