manifest.json

{
    "name": "StatisText",
    "version": "0.1.1",
    "description": "Displays useful statistics about a selected piece of text.",
    "manifest_version": 2,
    "icons": {
        "48": "logo_48.png",
        "128": "logo_128.png"
    },
    "permissions": [
        "tabs",
        "<all_urls>"
    ],
    "browser_action": {
        "default_title": "Count Words",
        "default_popup": "stats.html"
    },
    "background": {
        "scripts": [
            "hot-reload.js"
        ]
    },
    "content_scripts": [
        {
            "matches": [
                "<all_urls>"
            ],
            "js": [
                "countWords.js"
            ],
            "run_at": "document_start",
            "all_frames": true
        }
    ],
    "commands": {
        "_execute_browser_action": {
            "suggested_key": {
                "default": "Ctrl+Shift+Q",
                "mac": "MacCtrl+Shift+Q"
            },
            "description": "Opens stats.html"
        }
    }
}