JS rules don't work on xda-developers.com in Firefox

[AdamWr]

Steps to reproduce

1. Add this rule to user filter - xda-developers.com#%#console.log("Test");
2. Go here - https://www.xda-developers.com/

Expected behavior

JS rules should work

Screenshot

Actual behavior

JS rules don't work

Screenshot:

It's probably due to rules like these:
$webrtc,domain=xda-developers.com
$websocket,domain=xda-developers.com

Your environment

• AdGuard AdBlocker extension version: 2.9.2
• Environment name and version: Firefox 59.0.2
• Filters you use in AdGuard: English
• Any other browser extensions you have installed: -

[BlazDT]

Site seems to override something and sets some cookies with "conv". When those cookies are present, javascript rules seem to non-working anymore. On clean visit the following rule works fine, when waiting a bit and then changing to another article, it reads those cookies and is messing with our javascript rules:

xda-developers.com#%#window.alert("Hello");