Examine source code of Backstabbr Helper

{
  "manifest_version": 2,
  "name": "Backstabbr Helper",
  "author": "Alex Ward (alxwrd@googlemail.com)",
  "homepage_url": "https://www.github.com/alxwrd/backstabbr-helper",
  "version": "0.4",
  "description": "Improvements to backstabbr.com",
  "browser_action": {
    "default_area": "navbar",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png"
    },
    "default_title": "Backstabbr Helper",
    "default_popup": "menu.html"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "matches": [
        "*://*.backstabbr.com/*"
      ],
      "js": [
        "backstabbr-helper-js/backstabbr.js",
        "backstabbr-helper-js/redis/rgbcolor/rgbcolor.js",
        "backstabbr-helper-js/redis/canvg/canvg.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "backstabbr-helper-js/inject.js"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  }
}