manifest.json

{
    "name": "Hello World",
    "version": "1.0.0",
    "description": "Simple Microsoft Edge Extension",
    "author": "Hrishikesh Kale",
    "icons": {
       "16": "icons/icon_16.png",
       "32": "icons/icon_32.png",
       "48": "icons/icon_48.png",
       "128": "icons/icon_128.png"
    },
    "browser_action": {
        "default_icon": {
            "20": "icons/icon_20.png",
            "25": "icons/icon_25.png",
            "30": "icons/icon_30.png",
            "40": "icons/icon_40.png"
        },
        "default_title": "Hello World"
    },
    "permissions": [
        "contextMenus",
        "tabs",
        "storage",
        "activeTab",
        "<all_urls>"
    ],
    "minimum_edge_version": "37.14316.1000.0",
    "background": {
    "page": "background.html",
    "persistent": true
  },
    "content_scripts": [
    {
      "matches": ["http://*/*", "https://*/*"],
      "css" : ["css/light.css"],
      "js": ["js/content.js"],
      "run_at": "document_end"
    }
  ]
}