- Adblock Plus.
- Element Hiding Helper for Adblock Plus
- Webmail Ad Blocker
- Back/Forward History Tweaks
- Fat-Free Fox
- New Tab Tools
- Private Tabs
- Better URL Bar
- F.B. Purity
Not to mention a whole bunch of modifications in about:config. Recently those that will make Youtube loads the whole video in HD instead of buffering every few seconds.
I find it hard to replicate the experiences in Chrome. You might comment on the Adblock Plus, but I have been using it since it comes out. Other blocking software that install at OS level is not allowed at my working place, so I just use ABP.
There's a couple more on different systems that I have.