Blocking google account without blocking google search - help how do i do it

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i have blocked gmail but you can log in via google accounts log in.

how do i block the log in?  the site is:

https://www.google.com/accounts/ServiceLogin?hl=en&continue=http://www.google.co.uk/firefox%3Fclient%3Dfirefox-a%26rls%3Dorg.mozilla:en-GB:official

i dont want to block google, just this one page of google