If Firefox has been feeling sluggish for you lately, you might be able to cut down on some of those UI hangs with an about:config tweak.
The Mozilla team is working on a number of performance tweaks for upcoming versions of Firefox, one of which is the use of a new HTTP cache that should fix some UI hang issues. It isn't enabled by default yet, but will be soon -- and you can enable it right now with an about:config tweak. To do so:
about:configinto Firefox's address bar and press Enter.
Search for the
browser.cache.use_new_backendflag and double-click on it.
Change its value from 0 to
1to enable the new cache. (You can flip it back at any time by changing it back to
- 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, check out some of our other favourite tweaks.