DocHub - Sign PDF from Gmail

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        "default_popup": "popup.html"
    },
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        {
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                "https:\/\/mail.google.com\/mail\/*"
            ],
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                "js\/continually-wait-until-exists.js",
                "js\/cs-gmail.js"
            ],
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                "styles\/gmail.css"
            ],
            "run_at": "document_end"
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                "*:\/\/*\/*.pdf"
            ],
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                "js\/continually-wait-until-exists.js",
                "js\/cs-pdf-viewer.js"
            ],
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                "styles\/pdf-viewer.css"
            ],
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            "run_at": "document_end"
        },
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                "https:\/\/dochub.com\/*",
                "https:\/\/production.dochub.com\/*",
                "https:\/\/staging.dochub.com\/*",
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                "https:\/\/localhost:4200\/*"
            ],
            "js": [
                "js\/continually-wait-until-exists.js",
                "js\/cs-dochub-website.js"
            ],
            "run_at": "document_start"
        }
    ],
    "background": {
        "service_worker": "js\/background.js"
    },
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        {
            "resources": [
                "blank.html",
                "js\/dh-launcher.js",
                "\/images\/*"
            ],
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            ]
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            "https:\/\/staging.dochub.com\/*",
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}