The cause of this bug is the unity-menubar.patch file, which Ubuntu and
various other distros use to integrate firefox's menubar with Unity's,
was updated but the context around that patch changed (ie Firefox
changed) and the patch did not take that into account.

shows that the patch is trying to run the 'filter' method on
`toolbarNodes`, but as of 59, `toolbarNodes` is no longer an array, it's
just a list of child nodes, and so it has no `filter` method, and the
call throws an exception.

To get this fixed someone needs to update that patch to enforce that
it's using an array.

(sorry for the arch link, pretty sure Ubuntu is using the same debian patch, 
but I just spent 15 minutes trying to find a source link (online vcs rather 
than, say, a tarball which I obviously can't link into) that's used for 
ubuntu's package and can't, so...)

** Bug watch added: Mozilla Bugzilla #1428938

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  Firefox: View > Toolbars is Missing "Bookmarks Toolbar"

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