My local access provider, citizens.coop, offers a speedtest at http://speedtest.citizens.coop/
-- which I've been using, every once in a while, for months.
Suddenly all that shows there is the word adblock, in what looks like a tab -- it has a line around three sides.
I clicked the green button. No change. I deleted the line. No change.
Not even disabling adblock altogether gets me the test back.
Somewhere, I *think*, I've seen a kind of whitelist, or list of exceptions to blocking, or some such; but I can't seem to get back to it again -- neither by right-clicking on the blocked page, nor by clicking on AdblockPlus in the Tools menu.