Examine source code of NoMentions

{
  "manifest_version": 2,
  "name": "NoMentions",
  "version": "1.2resigned1",
  "description": "Replaces all mentions of men with a pretty image.",
  "author": "Deb Verhoven",
  "homepage_url": "http://www.nomentions.com",
  "developer": {
    "name": "James Price",
    "url": "https://neurotechnics.com/blog"
  },
  "icons": {
    "48": "images/nomentions-button-48.png",
    "96": "images/nomentions-button-96.png"
  },
  "web_accessible_resources": [
    "images/nomentions-button-32.png",
    "images/nomentions-button-48.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "nomentions.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{704b902b-3238-47e6-930c-f024f2d6ef5a}"
    }
  }
}