my ip in black list

Hello! Today I installed an addon in 
https://chrome.google.com/webstore/detail/html-validator/cgndfbhngibokieehnjhbjkkhbfmhojo 
Google Chrome in order to make validation quicker. After that (within an 
hour) an issue with validation functionality arose.

####################################
Sorry! This document can not be checked.
*Excessive traffic pattern blocked*
Due to excessive traffic we are blocking a pattern from specific browser 
plugins. If you are using a browser plugin that checks every single page 
you visit, please discontinue using it and only use selectively.
Please use the form interface on the Validator Home Page to check the 
page by URL.
####################################

According to the received message my IP was blacklisted by your server. 
The addon I have metioned above was uninstalled. Please, unblock my IP 
(178.165.84.36).

Thank you!

-- 
  Best regards,
  Alexey Panenko
  aleksey.panenko@w3.ua