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var webview = document.querySelector('webview');
webview.addContentScripts([
    {
        "name": "myAwesomeRule",
        
        // Specifies which pages this content script will be injected into.
        "matches": ["http://somesite.com"],
        
        // CSS files to be injected into matching pages.
        "css": ["mystyles.css"],
        
        // JS files to be injected into matching pages.
        "js": ["jquery.js", "myscript.js"]
    }
]);