Page Ruler

manifest.json

{
  "name": "Page Ruler",
  "short_name": "page-ruler",
  "description": "Page-ruler measure page elements size in pixel with an easy-to-use rule",
  "version": "0.0.3",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_title": "Page Ruler",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}