USE AT OWN RISK
There are a few ways to improve Firefox Page Load Times. This is one.
If you have lots of ram try this. Move Cache to Ram.
1. In address bar of Firefox, type in about:config and hit Enter.
Click the button says “I’ll be careful, I promise!”
2. Stop Firefox from caching to disk.
In the filter bar, type in browser.cache.disk.enable. Double-click on the result line to set value to false. Or you can find it in the list and double click it to say false.
3. Enable cache to RAM and assign cache size.
To enable cache to RAM, type “browser.cache.memory.enable” in the filter bar and make sure the value of result preference is true!
To assign cache size, create a new preference:
right click on blank area -> select “New” -> Integer
type in name “browser.cache.memory.capacity”
type in a value, number in KB (for example, 100000 means 100,000KB or 100MB). You can set the value to -1 to tell Firefox to dynamically determine the cache size.