manifest.json

  {
    "name": "Page Clock",
    "version": "0.1",
    "description": " Show time in 12 hour format at bottom right corner",
    "permissions": ["storage"],
    "browser_action": {
          "default_icon": {
            "16": "images/icons8-watch-64.png",
            "24": "images/icons8-watch-64.png",
            "32": "images/icons8-watch-64.png"
          },
          "default_title": "Page Clock",
          "default_popup": "popup.html"
        },
    "icons": {
      "16": "images/icons8-watch-64.png",
      "32": "images/icons8-watch-64.png",
      "48": "images/icons8-watch-64.png",
      "128": "images/icons8-watch-64.png"
    },
    "content_scripts": [
        {
        "matches": [
            "<all_urls>"
            ],
        "js": ["content.js"],
        "run_at": "document_end"
        }
    ],
    "manifest_version": 2
  }