HI, i have the same problem also. Like some of the website needed a recaptcha i'm not robot, but it dosen't appear at all. Help solve this problem.
I'm a student
I'm a student
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What sites? Your asking the impossible question where no one can look to where the error is coming from nor how to find it.
Make sure you are not blocking content.
Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?