1px: Simple ruler

A simple ruler for measuring the size of blocks on a page

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manifest.json

{
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "__MSG_name__"
  },
  "default_locale": "en",
  "description": "__MSG_description__",
  "icons": {
    "16": "ico_16_mono.png",
    "48": "ico_48.png",
    "128": "ico_128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_name__",
  "short_name": "__MSG_short_name__",
  "permissions": [
    "activeTab"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.0.1"
}