Extension installation error ”Invalid value for ‘content_scripts[0].matches[0]’: Missing scheme separator.”(Edge,Chrome)

The purpose 

Troubleshooting custom extension installation errors in Chrome and Edge.

Invalid value for ‘content_scripts[0].matches[0]’: Missing scheme separator.

マニフェストを読み込めませんでした。

Detail

the error “Invalid value for ‘content_scripts[0].matches[0]’: Missing scheme separator” is shown, when attempting to register an extension with the manifest file below.

{
  "name": "Sample",
  "version": "1",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [ "enblog.marunokan.com/*" ],
      "js": ["sample.js"]
    }
  ]

}

Reason

The cause is in the message, as shown in the following line.

      "matches": [ "enblog.marunokan.com/*" ],

The issue is that the specified URL is missing “https://” or “http://”.

Solution

As reason, the following line will be corrected. 

      "matches": [ "enblog.marunokan.com/*" ],

correct it as follows

      "matches": [ "https://blog.en.marunokan.com/*" ],

Result

We are able to successfully register the browser.

The following message appears in the bottom-left corner of the screen when you register it with Chrome.