Read this on another forum. You can speed up the loading of websites using Mozilla Firefox using these steps:

1. Type about:config in the address bar.
2. # network.http.pipelining (change from False to True by double clicking or right clicking and clicking on Toggle)
3. # network.http.proxy.pipelining (change from False to True)
4. # network.http.pipelining.maxrequests (change to 30)
5. Create a new value by right clicking anywhere, go down to New and click on Integer. For preference name insert "nglayout.initialpaint.delay" and for the value put in 0.

If anyone has any problems let me know. I tried it out and it seems like websites do load faster.