Examine source code of Disable Hyphenation

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.1resigned1",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/M-Reimer/disable-hyphenation",
  "author": "Manuel Reimer",
  "applications": {
    "gecko": {
      "id": "{d1f6c73f-aa61-4787-8e4e-810ca91b832e}",
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "24": "icons/disable-hyphenation.svg",
    "32": "icons/disable-hyphenation.svg",
    "50": "icons/disable-hyphenation.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": [
        "stylesheet.css"
      ]
    }
  ],
  "default_locale": "en"
}