old_manifest.json

{
    "manifest_version": 2,
    "name": "Goodreads Compare Books",
    "description": "Adding info about similarity of user's tastes on Goodreads site.",
    "version": "0.4",
    "author": "Petr Kubát",    
    "content_scripts": [{        
        "js": ["js/jquery-3.3.1.min.js", "js/tippy.all.min.js", "js/alertify.min.js", "js/background.js"],
        "css": [ "css/alertify.min.css", "css/themes/default.min.css" ],
        "matches": [ "https://www.goodreads.com/","https://www.goodreads.com/*/*"]
    }],
    "permissions": [
        "activeTab",
        "https://www.goodreads.com/*/*",
         "storage"
    ], 
    "web_accessible_resources": [
        "css/*"
    ],
    "browser_action": {
        "default_icon": {
            "19": "icons/icon_19.png",
            "38": "icons/icon_38.png"
          },
        "default_title": "Goodreads Compare Books",      
        "default_popup": "html/popup.html"
    },
    "icons": { "16": "icons/icon_16.png",
        "48": "icons/icon_48.png",
       "128": "icons/icon_128.png" 
    }    
}