Examine source code of Fixed Zoom

{
  "description": "Extension that sets a default fixed zoom for all pages in Firefox",
  "manifest_version": 2,
  "name": "Fixed Zoom",
  "version": "2.1.6resigned1",
  "homepage_url": "https://github.com/Enchufadoo/fixedzoom",
  "icons": {
    "64": "icons/binoculars.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "commands": {
    "more-fixedzoom": {
      "suggested_key": {
        "default": "Alt+Period"
      },
      "description": "Increase the zoom level for fixed zoom"
    },
    "less-fixedzoom": {
      "suggested_key": {
        "default": "Alt+Comma"
      },
      "description": "Reduce the zoom level for fixed zoom"
    }
  },
  "browser_action": {
    "default_icon": "icons/binoculars_black.png",
    "default_title": "Fixed Zoom",
    "default_popup": "options/options.html",
    "browser_style": false
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a655a6b2-69a5-40de-a3b8-3f7f200c95a7}"
    }
  }
}