Replaced DOMNodeRemoved event by MutationObserver

[scaraux]

Fixes #.

DOMNodeRemoved event is now deprecated an unsupported by Chrome browser, in favor of MutationEvent.

The issue is that the tooltip remains on screen and page has to be reloaded for it to disappear, which is very disturbing for the user experience.

Changes proposed in this pull request:

Replaced the deprecated event by MutationObserver

[linux-foundation-easycla[bot]]

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[s-pace]

We would love this here

[inlinecoder]

Guys, any updates? 🤔

[ArianSha]

bump