Add $replace and $$ rules partial support

[ameshkov]

Firefox now supports filterResponseData which gives us the ability to filter HTML responses body:
https://blog.mozilla.org/addons/2017/09/28/webextensions-in-firefox-57/

Also, this question implies that the very same feature is available in Chrome:
https://support.mozilla.org/en-US/questions/1176377

function listener(details) {
 let filter = browser.webRequest.filterResponseData(details.requestId);
 let decoder = new TextDecoder("utf-8");
 let encoder = new TextEncoder();

 filter.ondata = event => {
    let str = decoder.decode(event.data, {stream: true});
    str = str.replace(/Example/g, 'WebExtension Example');
    filter.write(encoder.encode(str));
    filter.disconnect();
 }

 return {};
}

browser.webRequest.onBeforeRequest.addListener(
 listener,
 {urls: ["https://example.com/*"], types: ["main_frame"]},
 ["blocking"]
);

So, we can use it to implement partial support of $$ and $replace rules.

Applying $$ rules may be slow as we need to use DOMParser. To mitigate it we need to limit $$ rules to domain-specific rules only.

[ameshkov]

I can't find it in Chromium's sources, though. So the use of it may be limited to Firefox only

[ghajini]

@ameshkov,
$$ rule -useful for browser extension users(there is limit I think $$) this is useful for longstanding instart logic crap...

[ameshkov]

Both $$ and $replace are really useful and can help us. Unfortunately, in FF only

[ghajini]

Basically I was restricted from using adguard chrome browser extension becoz instart logic bypasses chrome extension due to large inline scripts....this work as per AdamWr in adguard for windows but not work in browser extension due to limited $$rule support.......

AdguardTeam/AdguardFilters#3844

[ameshkov]

We've figured a way for FF, eventually we'll find a way for Chrome as well

[BooBerry]

I guess Edge and Safari are out in the cold then? =P

Great news, hopefully you guys will find a way for Chrome too. 👍

[zebrum]

doesn't work

I've checked with this rules:

forum.ru-board.com$$table[width="95%"]
lenta.ru$$div[class="logo-wrap js-logo"]