Examine source code of jisho-pitcher

{
  "manifest_version": 2,
  "name": "jisho-pitcher",
  "version": "1.7",
  "description": "Adds pitch accent information to entries in the online Japanese-English Dictionary at jisho.org",
  "icons": {
    "48": "icons/border-48.png",
    "96": "icons/border-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61dff19a-4460-42de-9825-1ed4f0813091}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.jisho.org/*"
      ],
      "js": [
        "jisho_pitcher.js"
      ]
    }
  ]
}