PWA theme

manifest.json

{
  "manifest_version": 2,
  "name": "PWA theme",
  "version": "1.0",
  "description": "Dynamic theme for Progressive Web Apps",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "match_about_blank": true,
      "run_at": "document_idle"
    }
  ],
  "applications": {
    "gecko": {
      "id": "themes@pwa",
      "strict_min_version": "60.0"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "theme",
    "<all_urls>",
    "tabs"
  ]
}