Not just page content. They can read your cookies, they can see all requests (just not modify them on the fly). The extensions tracking you acting as spyware wi

Not just page content. They can read your cookies, they can see all requests (just not modify them on the fly). The extensions tracking you acting as spyware will see no change, the other kind of malicious extensions that want to modify your requests will still do so by modifying the DOM of pages for example. So the "security" reasons google gave have long been debunked as non-sense. The other half is the performance reasons. What's the performance burden of calling a (chain) blocking webRequest listeners? Last time I checked it was single digit milliseconds per request. So a very ad-laden worst-case website with 100 requests will spent maybe 500ms in the webRequest listeners, but will still load faster thanks to all the cruft being blocked away. So what's the win for performance exactly?