Math Captcha is a 100% effective CAPTCHA for WordPress that integrates into login, registration, comments, Contact Form 7 and bbPress.
I like a simple Captcha like this.
But in current Firefox, the math is wrong. If you try random numbers, it will finally accept it. But this is creating a barrier to commenting.
I brought it up in the support forum but no solution arose.
I also had a problem with it being messed up on the Comments form but managed to sort out the custom CSS for that.
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