> That was weird, the no-js version didn't work. It just sat there spinning.

What extensions do you have installed? There's a known and unfixable issue with browsers that both block JS and absolutely block all requests to tracking domains (eg AdAway, which modifies /etc/hosts).

> What, why would I unblock those?

To incentivise better behaviour by web publishers and advertisers!

ublock was stopping requests to third parties. Though the javascript version didn't care that third party requests were blocked, only the no-js version.

It's kind of weird for something specifically dedicated to measuring tracking to get so confused by an anti-tracking mechanism.

> To incentivise better behaviour by web publishers and advertisers!

Maybe if it could have some legal teeth to it, otherwise it's too easy to lie to get your tracker unblocked.

>To incentivise better behaviour by web publishers and advertisers!

I switched off "Do Not Track" in my options since only good-behaving websites listen to it, such as those using Piwik analytics, which respects privacy. Therefore I only would harm good people with Do Not Track on.

With certain rare configurations (if you have a domain-based blacklist blocker and javascript disabled) this may occur. I suggest turning your js back on just for the test.