<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link
    rel="stylesheet"
    type="text/css"
    href="{{ "css/main.css?ts=" | relURL }}{{ now.Unix }}"
  />
  <title>{{ with .Title }}{{ . }} – {{ end }}{{ .Site.Title }}</title>
</head>

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link
    rel="stylesheet"
    type="text/css"
    href="{{ "css/main.css?ts=" | relURL }}{{ now.Unix }}"
  />
  <title>{{ with .Title }}{{ if not ( eq . $.Site.Title) }}{{ . }} – {{ end }}{{ end }}{{ .Site.Title }}</title>
</head>

Remove page title from browser tab if = site title
Remove page title from browser tab if = site title
