OK so I added more logs. It looks like this is caused by a mismatched port connect/disconnect call. Navigating from forms.html to hello.html and pressing back we get ``` connect from forms.html disconnect from forms.html connect from hello.html connect from forms.html disconnect from hello.html ``` at the last `disconnect` call we destroy the port for `forms.html` (even though the disconnect call is for `hello.html`) because we don't expect call out of order. Checking for the port object should fix this problem.
Bug 1717506 Comment 34 Edit History
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OK so I added more logs. It looks like this is caused by a mismatched port connect/disconnect call. Navigating from forms.html to hello.html and pressing back we get ``` connect from forms.html disconnect from forms.html connect from hello.html connect from forms.html disconnect from hello.html ``` at the last `disconnect` call we destroy the port for `forms.html` (even though the disconnect call is for `hello.html`) because we don't expect calls to be out of order. Checking for the port object should fix this problem.