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ExtendedCss recursively calls MutationObserver #1317
This link https://4pda.ru/2017/03/19/338134/ causes over 100% load in the chrome task manager
This happens because of Sizzle, which changes id attribute while executes the querySelectorAll request.
These 3 rules
sizzle changes id in this part of code
Because loop protection filters only mutations with style attributes