Tweak #1:
In the Filter bar type [network.http.pipelining]. Then, double-click on this line under Preference Name in order to change the value from false to true.

Tweak #2:
In the Filter bar type [network.http.pipelining.maxrequests]. Then, double-click on this line under Preference Name and change the value from 4 to a higher number anywhere from 10 to 30. I set mine to 30.

Tweak #3:
In the Filter bar type [network.http.proxy.pipelining]. Then, double-click on this line under Preference Name in order to change the value from false to true.

Tweak #4:
In the Filter bar type [network.dns.disableIPv6]. Then, double-click on this line under Preference Name in order to change the value from false to true.

Tweak #5:
In the Filter bar type [plugin.expose_full_path]. Then, double-click on this line under Preference Name in order to change the value from false to true.

full list via articlesbase

1. Use a fast, minimal browser. 
2. Use tabs, not windows.
3. Learn keyboard shortcuts. 
4. Set up keyword bookmarks and speed dial.
5. Set up keyword searches.
6. Set up keyword bookmarklets.
7. Fast online bookmarking.
8. Block Flash.
9. Distraction-free reading and videos.
10. Turn off most extensions.
11. Don’t have a million tabs open.
12. Clear most of your toolbars. 
13. 1password or KeePass.
14. Tuning out the Internet.

via zenhabits