Examine source code of bananacamp

{
  "name": "bananacamp",
  "version": "0.0.4",
  "description": "Automatically finds an artist's Bandcamp page while browsing Spotify Web.",
  "author": "Addie Barron",
  "homepage_url": "https://github.com/addiebarron/bananacamp",
  "manifest_version": 2,
  "minimum_chrome_version": "74",
  "browser_specific_settings": {
    "gecko": {
      "id": "bananacamp@addiebarron.github.io",
      "strict_min_version": "67.0"
    }
  },
  "icons": {
    "128": "icon.png"
  },
  "web_accessible_resources": [
    "media/*"
  ],
  "permissions": [
    "tabs",
    "*://bandcamp.com/*",
    "*://*.spotify.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://open.spotify.com/artist/*"
      ],
      "css": [
        "content/style.css"
      ],
      "js": [
        "content/index.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "128": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background/index.js"
    ]
  }
}