uBlock Origin for Google Chrome and apiBreaker

[dimisa-RUAdList]

uBlock Origin 1.12.4
uBlock filters
EasyList
RU AdList
Google Chrome 58.0.3029.110 (64-bit)

http://www.segodnya.ua/culture/stars/emili-blant-i-tom-kruz-vernutsya-v-gran-budushchego-2-1020015.html

[gorhill]

Description of what is happening on that page.

The site uses a MutationObserver to detect changes to the style attribute of the ad-laden iframe tag, to restore the display: block !important; style. uBO does the same, except that is to restore the display: none !important; style. So both are fighting to have their style enforced, this causes constant mutation events to be fired, and both listeners to be constantly called as a result.

This is not an issue on Firefox because it supports user styles, there is no need for uBO to modify the style attributes of the iframe.

I did observe that I could improve uBO's mutation listener code by using a Set() instead of an Array to coalesce the nodes reported in mutation events. When using an array, uBO has to iterate through over a thousand entries, all for the same two nodes, while if using a Set(), there is only two entries to iterate though. However when using a Set(), the page's style wins -- the iframe ends up not being hidden, which means in the end the solution for the not-hidden iframe has to be something else.

[dimisa-RUAdList]

https://greasyfork.org/ru/scripts/19993-ru-adlist-js-fixes/code#n869

[evenfrost]

@gorhill Same thing started happening here recently, and that's incessant fight for display: none !important.

[gorhill]

@evenfrost Fixed, filter added to "uBlock filters".

Another solution is to use Firefox, it supports user styles and these can't be fought.

Also, it's better to just report to uAssets next time.

[evenfrost]

Thanks for fast fix! 🎉