I can't tell you the exact conjuncture but i suppose it can be generalized from some facts :
it happens with pages that contains multiple JavaScript closures and multiple [Kendo] tabs;
and another possible cause could be the page has HTML tags errors (and maybe JS/CSS errors too ?).

I tried to replicate the problem with web pages such gmail, etc, but there was no page crash.

Since the page I am working with it's not available to the public i can not provide you with a link - but i am sure the operacrash report is sending automated reports.

Sorry for being so vague.

PS: there are no errors displayed in Developer Tools Console log.