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When explorer 10 started reporting in js the availability of the firefox xml parser object but then it was not compatible and all code parsing xml suddenly broke for no reason, which is not javascript per se but it isn't like the language exists in a vacuum

Or if you want language proper at some point node allowed keywords to be used as properies.

The problem now a days is phones. Their browsers work very different from desktop browsers.

And set top box that may have another version of JS.

Or the "javascript" used in Qt ... or any new appliance/software that wants to provide a common accessible language for their "events" and choose a JS that is patched to support stuff like hardware functions.

I have been using these kinds of FrankeinJS in the past.

Well, read the source of jquery. You will see fixes for "old new features" of FF that broke applications in the past.

Given the way mozilla teams are still working I guess it can still happen.

EDIT and add the memory leaks and the change of performance that happens from time to time in new releases.