[Deprecation] Listener added for a synchronous 'DOMSubtreeModified' DOM Mutation Event

[muescha]

There are deprecation informations are logged at the console:

Console Logs

Deprecated Feature Used
DOM Mutation Events, including 
	DOMSubtreeModified, 
	DOMNodeInserted, 
	DOMNodeRemoved, 
	DOMNodeRemovedFromDocument, 
	DOMNodeInsertedIntoDocument, 
	and DOMCharacterDataModified 
are deprecated ( https://w3c.github.io/uievents/#legacy-event-types ) 
and will be removed. Please use MutationObserver instead.
1 source
chrome-extension://hhojmcideegachlhfgfdhailpfhgknjm/web_accessible_resources/index.js:11

and for each Event:

[Deprecation] Listener added for a synchronous 'DOMSubtreeModified' DOM Mutation Event. 
This event type is deprecated (https://w3c.github.io/uievents/#legacy-event-types) 
and work is underway to remove it from this browser. 
Usage of this event listener will cause performance issues today, 
and represents a risk of future incompatibility. 
Consider using MutationObserver instead.

(anonymous) @ chrome-extension://h…sources/index.js:11
Mutation.bind @ chrome-extension://h…sources/index.js:10
Mutation @ chrome-extension://h…esources/index.js:7
handleEvent @ chrome-extension://h…ources/index.js:107

ScreenShot: