Examine source code of Text Legibility

{
  "manifest_version": 2,
  "name": "Legibility",
  "short_name": "Legibility",
  "description": "Makes illegible webpages legible by adjusting text size, contrast, and links.",
  "version": "2.0.5resigned1",
  "browser_action": {
    "default_icon": "images/icon136.png",
    "default_popup": "popup.html",
    "browser_style": false
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "common.js",
        "contentscript.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "images/icon136.png"
  },
  "web_accessible_resources": [
    "images/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4fe52e6f-3e1a-471a-a32f-193dbc3c647d}"
    }
  }
}