Examine source code of SynestheFox

{
  "applications": {
    "gecko": {
      "id": "synesthefox@dessix.net"
    }
  },
  "manifest_version": 2,
  "name": "SynestheFox",
  "version": "1.18resigned1",
  "description": "Color code individual characters on pages you view -- induce color-graphemic synesthesia",
  "icons": {
    "128": "128-t.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "contentScript.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*/*"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  }
}