Examine source code of Sticky Password manager & safe

{
  "name": "__MSG_appName__",
  "version": "8.9.11.1345",
  "description": "__MSG_appDesc__",
  "applications": {
    "gecko": {
      "id": "{ecb80162-dfbd-4d91-a8da-17b35ba4707a}",
      "strict_min_version": "58.0"
    }
  },
  "default_locale": "en",
  "manifest_version": 2,
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "spFormElementPrototypeEx.js",
    "spWebAuthnPageScript.js"
  ],
  "homepage_url": "https://www.stickypassword.com",
  "background": {
    "page": "spBackground.html"
  },
  "icons": {
    "16": "skin/logo16.png",
    "32": "skin/logo32.png",
    "48": "skin/logo48.png",
    "128": "skin/logo128.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": "skin/logo16-disabled.png",
    "default_title": "Sticky Password",
    "default_popup": "spPopup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "spSettings.html"
  },
  "permissions": [
    "https://sp-cc.s3.amazonaws.com/responses/*",
    "https://spcb.stickypassword.com/SPCClient/AutofillStartSessionExt*",
    "privacy",
    "tabs",
    "storage",
    "notifications",
    "nativeMessaging"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "spRequire.js",
        "spLog.js",
        "spStrings.js",
        "spAutofillCore.js",
        "spBrowserSpecificTools.js",
        "spPageEventsMonitor.js",
        "spExtensionStorage.js",
        "spWebAuthnContent.js",
        "spContent.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://*.stickypassword.com/*sp-autofillplugin-uninstall.html*",
        "file:///*spAutofill.xpi.uninstall.html"
      ],
      "js": [
        "spUninstallRedirect.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ]
}