manifest.json

{
    "manifest_version": 3,
    "name": "Youtube to Spotify",
    "description": "Quickly play YouTube songs on Spotify",
    "version": "0.1",
    "action": {
      "default_popup": "popup.html",
      "default_icon": "icons/spotify.png"
    },
    "permissions": ["scripting", "activeTab", "storage", "contextMenus", "tabs"],
    "host_permissions": [
        "*://*.youtube.com/*"
    ],
    "background": {
        "service_worker": "src/contextMenu.js"
    },
    "content_scripts": [
        {
            "js": ["src/shared.js", "src/callback.js"],
            "matches": [
                "https://www.youtube.com/yt2spotify-callback"
            ]
        },
        {
            "js": ["src/shared.js", "src/buttons.js"],
            "matches": [
                "https://www.youtube.com/watch*"
            ]
        }
    ],
    "icons": {
        "16": "icons/spotify-16.png",
        "48": "icons/spotify-48.png",
        "128": "icons/spotify-128.png"
    }
}