manifest.json

{
    "manifest_version": 3,
    "version": "0.0.0.1",
    "name": "Web Fonts Unicode Range",
    "description": "Show unicode range of each font on your webpage for creating minimal font subsets",
    "icons": {
        "16": "images/icon-16.png",
        "32": "images/icon-32.png",
        "48": "images/icon-48.png",
        "128": "images/icon-128.png"
    },
    "action": {
        "default_title": "Click to Show unicode range of each font",
        "default_icon": {
            "16": "images/icon-16.png",
            "32": "images/icon-32.png",
            "48": "images/icon-48.png",
            "128": "images/icon-128.png"
        }
    },
    "permissions": ["activeTab", "scripting", "sidePanel", "storage"],
    "background": {
        "service_worker": "background.js"
    },
    "host_permissions": ["https://*/*", "http://*/*"],
    "content_scripts": [
        {
            "js": ["content.js"],
            "matches": ["https://*/*", "http://*/*"]
        }
    ],
    "side_panel": {
        "default_path": "sidepanel.html"
    }
}