I creating firefox extension when add this into firefox all works right but when i open a new link show a dialog box with message "Error: document body is null"

I am creating firefox extension (No error in extension because it work fine in chrome). But it show box with error "Error: document.body is null" why

Thanks for reply cor-el &jscher2000
i am not using "window.content.document.body".
we send some screenshots for understanding problem
i created this extension for firefox, chorme
It Works fine in chrome but in firefox show error(Which have no effect on my extension or other browsing).

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