Mozilla has blocked execution of all inline scripts and potentially dangerous eval-like functions for built-in “about: pages” Firefox browser has 45 such internal locally-hosted about pages. Mozilla vows to “closely audit and evaluate” the usages of harmful functions in 3rd-party extensions. The changes do not affect how websites from the Internet work on the Firefox browser, but going forward, the browser maker vows to audit the use of harmful extensions and 3rd party extensions. Google also shares the same thought, as the tech giant says, “eval is dangerous inside an extension”
Source: https://thehackernews.com/2019/10/firefox-javascript-injection.html