Bug 1578304 Comment 5 Edit History

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Original comment by
on 
I've actually managed to track this down to [this earlier revision](https://hg.mozilla.org/mozilla-central/rev/63ed84a799d9a54311cc1246574bf2fe8fc4b98c) (still by me).

I believe I've narrowed this down to being caused by plugin documents not having a docshell and therefore we bail out early in [BrowserChild::OnLocationChange](https://searchfox.org/mozilla-central/source/dom/ipc/BrowserChild.cpp#3613) and forward the event to the parent.
Revision 1 by
on 
I've actually managed to track this down to [this earlier revision](https://hg.mozilla.org/mozilla-central/rev/63ed84a799d9a54311cc1246574bf2fe8fc4b98c) (still by me).

~I believe I've narrowed this down to being caused by plugin documents not having a docshell and therefore we bail out early in [BrowserChild::OnLocationChange](https://searchfox.org/mozilla-central/source/dom/ipc/BrowserChild.cpp#3613) and forward the event to the parent.~

Edit: I was correct about the revision that caused this issue but incorrect about the underlying issue. The tab title is actually derived from elsewhere (a DOMTitleChanged message sent to the parent process and caught in the <browser>).

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