It's Firefox after newest update that causes this problem.
To solve it, people must click on the icon shown in the image below and chose ''Disable protection on this page'' in the box where is shown ''Keep Blocking''.

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Thanks for posting this solution, looks like after latest update Mozilla is blocking non-secured content (such as youtube, crowdflower, etc) on secured websites such as Clicks-FX.

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dear admin
i dont't see tanks more time.
pls admin check help me
tks admin

Do you mean tasks?
Create an account here:
https://auth.crowdflower.com/accounts/sign_in

Then log-in and contact Crowdflower about this issue providing your unique account ID (we sent it to you as a personal message).

They should be able to help.

Regards