SendSafely Encryption for Chrome and Gmail

Chrome extension that provides end-to-end encryption for Gmail. Encrypt private emails and securely share files up to 10GB.
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_manifest_chrome_extension_name__",
  "version": "1.10.6.1",
  "description": "__MSG_manifest_chrome_extension_description__",
  "manifest_version": 3,
  "default_locale": "en",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmmEk7XwbtQ5AulkvErc9WWesWJ+4JmHEAyJw5F/aaIk52FU8x+ND4GkPTkaMYdrXPSgRHbrt1jWIvRNLrq5ddcUY9JL5heiqEMB9/mLkhtnJRbzM+LdyWxw2c3jVzb9aCyc1FWxikjdKj+xVRB2U7V9Ry77RsnaI71WZsSganLOSfXjlf2Yn8BeY0PkPVeibhbUPARp+g36WRf8aWi0cGobQ3Bm6p7U8sAL+O6UeFBvttDN/pNSQVQV2000KVM/BG8dfpB04iaECyg4X10WXl9m64jK/8wboHVvCKnTYVtduguv/8msuf+iQyIXVs6rD8YQqNnrB2fBO9/O4Aj8u2QIDAQAB",
  "options_page": "html/popup.html",
  "action": {
    "default_title": "__MSG_manifest_chrome_extension_default_title__",
    "default_icon": {
      "19": "images/sendsafely_padlock_19.png",
      "38": "images/sendsafely_padlock_38.png"
    },
    "default_popup": "html/popup.html?view=popup"
  },
  "icons": {
    "16": "images/sendsafely_padlock_16.png",
    "48": "images/sendsafely_padlock_48.png",
    "128": "images/sendsafely_padlock_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.sendsafely.com/*",
        "https://*.sendsafely.co.uk/*",
        "https://*.sendsafely.eu/*",
        "https://*.sendsafely-au.com/*",
        "https://*.sendsafely.com.au/*"
      ],
      "js": [
        "/js/content_scripts/KeycodeLoader.js"
      ]
    }
  ],
  "permissions": [
    "clipboardWrite",
    "storage",
    "unlimitedStorage",
    "identity",
    "offscreen",
    "scripting"
  ],
  "optional_permissions": [
    "tabs",
    "downloads"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "css/bootstrap-switch.min.css",
        "css/flags.css",
        "css/sass_bootstrap.css",
        "css/jquery-ui.min.css",
        "js/injected_scripts/GmailContentPageInject.js",
        "js/injected_scripts/GmailInject.js",
        "js/content_scripts/init.js",
        "images/sendsafely_banner.png",
        "images/lock_open_16.png",
        "images/sendsafely_padlock_32.png",
        "images/lock_16.png",
        "images/sendsafely_padlock_100.png",
        "images/blank.gif",
        "images/flag_default.png",
        "images/loading.gif",
        "images/flags.png",
        "images/sendsafely_padlock_16.png"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    },
    {
      "resources": [
        "images/sendsafely_banner.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "background": {
    "service_worker": "js/service_worker/service_worker.min.js"
  },
  "content_security_policy": {
    "extension_pages": "default-src http://*.sendsafely.com:8080 'self' https://*.s3-accelerate.amazonaws.com https://mail.google.com https://www.googleapis.com chrome-extension://* https://*.sendsafely.com https://*.sendsafely.co.uk https://*.sendsafely.eu https://*.sendsafely-au.com https://*.sendsafely.com.au https://ahjndcndegkeginelijbfjchehhldgnc.chromiumapp.org; script-src 'self'; object-src 'self'; style-src 'unsafe-inline'; connect-src * data: blob: filesystem:;"
  },
  "oauth2": {
    "client_id": "1038922135064-ircl84vhei47ndqime5snkgca4j924bm.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/userinfo.profile"
    ]
  }
}