Steps:
Type "about:config" without quotes in Firefox address bar as following:
Then you will get following screen and click on "I will be careful"
Step 1:
Enable HTTP Cache
Open about:config and search for the following entry:
browser.cache.use_new_backend
Double-click on it and change the value from 0 to 1.
Step 2:
Clear Cache
To clear the cache click Options and then click on Advanced, you’ll see a Network tab that lets you clear the cache.
Step 3:
Firefox Pipelining
To enable pipelining, go to about:config and type innetwork.http.pipe in the filter box and you’ll see several settings.
