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Following further inspection, it is also apparent that there are one or
more additional settings, which also cause the issue. Unfortunately, I
don't have the time to look further in to it currently.
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Setting 'disable_toolbar_editing' to True causes 'Segmentation Fault' exception
Whether the issue is linked or not, I'd also like to confirm that
Firefox fails to start up after the same setting has been enabled (even
though the lockdown option is specifically for Epiphany Browser).
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Setting 'disable_toolbar_editing' to True causes 'Segmentation Fault' exception