{ "browser_action": { "default_icon": { "16": "images/icon-16.png", "19": "images/icon-19.png", "32": "images/icon-32.png", "38": "images/icon-38.png", "64": "images/icon-64.png", "128": "images/icon-128.png", "512": "images/icon-512.png" }, "default_title": "MetaMask Beta" }, "icons": { "16": "images/icon-16.png", "19": "images/icon-19.png", "32": "images/icon-32.png", "38": "images/icon-38.png", "48": "images/icon-48.png", "64": "images/icon-64.png", "128": "images/icon-128.png", "512": "images/icon-512.png" }, "name": "__MSG_appName__ Beta", "short_name": "__MSG_appName__ Beta" }