Is Flash Player that Works! safe?

Flash Player that Works fetches game listings from fflashgames.com and injects them into its popup without sanitizing the returned content.

Each time the extension popup opens, it requests an HTML page from fflashgames.com and parses game URLs and preview image URLs out of the response. Those values are interpolated directly into an HTML string and appended to the popup DOM via jQuery without any sanitization. Because this runs inside the extension popup (a chrome-extension:// page), any malicious content served by fflashgames.com would execute with access to Chrome extension APIs.