https://mail.yahoo.co.jp/ (I cannot provide an exact link because the registration link seems to be dynamic)
Having abp-japanese-filters makes it very likely for the yahoo.co.jp captcha to fail when making a new account, even if the characters are correct. It can take 2-10 tries with the filter enabled. It always takes me 1 try with the filter disabled. Reproduced on Firefox ESR (Windows 7), Firefox 51&52 (fedora), and Firefox 52.02 (Android7), all using ublock origin.
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"It can take 2-10 tries with the filter enabled" sounds odd to me.
I have never heard a wrong filter increase the repeating CAPTCHA input.
https://mail.yahoo.co.jp/ (I cannot provide an exact link because the registration link seems to be dynamic)
Having abp-japanese-filters makes it very likely for the yahoo.co.jp captcha to fail when making a new account, even if the characters are correct. It can take 2-10 tries with the filter enabled. It always takes me 1 try with the filter disabled. Reproduced on Firefox ESR (Windows 7), Firefox 51&52 (fedora), and Firefox 52.02 (Android7), all using ublock origin.