manifest.json

{
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    "default_locale": "en_US",
    "description": "__MSG_extensionDescription__",
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                "*://askubuntu.com/questions/*",
                "*://stackapps.com/questions/*",
                "*://mathoverflow.net/questions/*"
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            "css": [
                "hide-sidebar.css"
            ]
        }
    ],
    "content_security_policy": "default-src 'none'; style-src 'self'; script-src 'self'; object-src 'none'",
    "developer": {
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    },
    "permissions": []
}