1 frame back

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "1 frame back",
  "version": "1.5.0",
  "description": "1 frame back button. 1フレーム戻るボタン",
  "icons": {
    "16": "icons/left16.png",
    "48": "icons/left48.png",
    "128": "icons/left128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.disneyplus.com/*",
        "https://disneyplus.disney.co.jp/*",
        "http://www.youtube.com/*",
        "https://www.youtube.com/*",
        "http://watch.wwe.com/*",
        "https://watch.wwe.com/*",
        "http://www.nicovideo.jp/*",
        "https://www.nicovideo.jp/*",
        "https://www.b-ch.com/*",
        "https://video.unext.jp/play/*"
      ],
      "js": [
        "contents.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/left.png"
  }
}