Mozilla Firefox 67 comes with numerous performance improvements and new features to make your Firefox browsing experience better. To improve the overall performance, Mozilla did a few internal changes, such as to lower the priority of the “setTimeout” function during loading of web pages, delayed the component initialization until after Firefox’s start up, as well as to suspend unused tabs. A key feature of the Firefox 67 release, which most users will love, it’s a built-in cryptominer blocker, which blocks fingerprinters as well. You can find it in the Custom settings page of the Content Blocking preferences, so if you notice that your Firefox web browser eats too much RAM and CPU, try enabling these functions immediately and restart the web browser.