Measure-it

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Measure-it",
  "description": "Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.",
  "version": "2.1.0",
  "icons": {
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_32.png",
    "default_title": "Measure-it"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "commands": {
    "open-measure-it": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      },
      "description": "Open MeasureIt"
    }
  }
}