- Enter about:config into Firefox’s address bar and press Enter.
- Search for the browser.cache.use_new_backend flag and double-click on it.
- Change its value from 0 to 1 to enable the new cache. (You can flip it back at any time by changing it back to 0).
- Close about:config and continue browsing—no need to restart or anything.
I enabled it and while it hasn’t been a silver bullet, it seems to have helped decrease the number of times the browser screeches to a halt. Check out the link below for more info, and while you’re digging around in about:config,