Examine source code of Y'allifier

{
  "manifest_version": 2,
  "name": "Y’allifier",
  "short_name": "Y’allifier",
  "description": "Makes the words of the world a little gentler on the soul.",
  "author": "steev",
  "version": "1.7resigned1",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file:///Users/steev/code/y-allifier/you%20all%20test.html"
      ],
      "all_frames": true,
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{195d4640-7159-4cb9-a29b-e149ead8fbea}"
    }
  }
}