I'm sorry, I'm a bit  new to this, so the intricacies of the javascript scopes 
and zones aren't yet very clear to me.

Does that mean that the globals of the content script will automatically be 
cleaned up if the tab is closed or is it just a technicality of the GC and do 
you still have to do cleanup? Eg. compared to being in the same zone of the 
window or not, what exactly happens differently?

Should an explanation of this be added to the MDN page? I wouldn't mind to do 
it, but I don't feel I understand enough to give a good wording to it.
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