Firefox freezes on chrome://global/content/bindings/textbox.xml

Got an interesting and unexpected error message today from Firefox 58 which was running with just the default page — suddenly displayed a popup saying that a script on the following page is running slowly:

chrome://global/content/bindings/textbox.xml

I have found some references on Mozilla Developer site, however this does not look good from QA & testing point of view:

https://developer.mozilla.org/en-US/docs/Mozilla/About_omni.ja_(formerly_omni.jar)