Examine source code of ExplainXKCD Button

{
  "manifest_version": 2,
  "name": "ExplainXKCD Button",
  "version": "1.7.6resigned1",
  "author": "David Hickey",
  "homepage_url": "https://github.com/David-Hickey/ExplainXKCD-Button-Firefox",
  "description": "Replace one of the navigation buttons on XKCD with a link to ExplainXKCD.",
  "content_scripts": [
    {
      "matches": [
        "*://xkcd.com/*",
        "*://www.xkcd.com/*"
      ],
      "js": [
        "content-scripts/explainbutton.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ExplainXKCD-Button@davidhickey",
      "strict_min_version": "64.0"
    }
  },
  "icons": {
    "32": "icons/icon_32.png",
    "96": "icons/icon_96.png"
  }
}