[Bloat] Adblock - or another extension - is incorrectly blocking the speed test

[Jan Ceuleers]

Dear list,

I'm unable to use the speed test with either of my main browsers
(Firefox and Chrome, both under Linux) because of the above error
message. Even if I temporarily completely disable Adblock.

What is the problem here? Because what is incorrect is the error
message, not my use of browser extensions.

Thanks, Jan