Google has published JavaScript proof-of-concept (PoC) code to demonstrate the practicality of using Spectre exploits targeting web browsers to access information from a browser’s memory. Google advises web developers to use new security mechanisms to “mitigate Spectre-style hardware attacks and common web-level cross-site leaks”” Google Security Team also created a prototype Chrome extension named Spectroscope to help security engineers and web developers protect their websites from Spectre. Spectre security vulnerability was unveiled as a hardware bug by Google Project Zero security researchers in January 2018.”
Source: https://www.bleepingcomputer.com/news/security/google-shares-spectre-poc-targeting-browser-javascript-engines/