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manifest.json
{
  "manifest_version": 2,
  "name": "YouTube Thumbnail Viewer",
  "version": "0.3.0",
  "description": "Adds a YouTube thumbnail preview button to the address bar.",
  "homepage_url": "https://github.com/gifnksm/youtube_thumbnail_viewer",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "24": "icons/page_action.svg"
    },
    "default_title": "YouTube Thumbnail Viewer",
    "default_popup": "./popup/index.html"
  }
}