manifest.json

{
    "description": "Tries to play links in MPV",
    "manifest_version": 2,
    "name": "ff2mpv",
    "version": "5.1.1",
    "options_ui": {
        "page": "options/options.html",
        "open_in_tab": false
    },
    "icons": {
        "16": "icons/icon_16x16.png",
        "32": "icons/icon_32x32.png",
        "48": "icons/icon_48x48.png",
        "64": "icons/icon_64x64.png",
        "256": "icons/icon_256x256.png"
    },
    "browser_action": {
        "default_icon": "icons/icon_48x48.png",
        "default_title": "Play the current URL in MPV"
    },
    "commands": {
        "_execute_browser_action": {
            "suggested_key": {
                "default": "Ctrl+Shift+V"
            },
            "description": "Play the current URL in mpv"
        }
    },
    "applications": {
        "gecko": {
            "id": "ff2mpv@yossarian.net",
            "strict_min_version": "50.0"
        }
    },
    "background": {
        "scripts": [
            "browser-polyfill.js",
            "ff2mpv.js"
        ]
    },
    "permissions": [
        "nativeMessaging",
        "contextMenus",
        "activeTab",
        "storage"
    ]
}