Examine source code of remove OCS Subtitles

{
  "manifest_version": 2,
  "name": "removeOCSSubtitles",
  "version": "1.0",
  "description": "Remove subtitles from OCS",
  "icons": {
    "48": "icons/48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://go.ocs.fr/*"
      ],
      "js": [
        "OCSsubs.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png"
    }
  },
  "permissions": [
    "tabs",
    "cookies",
    "<all_urls>"
  ]
}