I use Firefox with:
Adblock Plus - For obvious reasons. I exclude it on pages I particularly think deserve support - usually forums I'm part of.
Bypass Paywalls - Mainly because a lot of newspapers expect payment for frankly irrelevant stuff like sports, etc. Which can hardly be called Premium/Exclusive. I'd understand paywalling a lot more of it was dedicated to political analysis etc ie "serious stuff" but most of it's actually used to get payment for everyday fluff.
FB Purity - Facebook - shock news coming - shows me a lot of crap I don't need to know. FB Purity gets rid of it for me.
I'm toying with DuckDuckGo, I like it simply because of it's name and logo TBPH, same reason I use Firefox. But mostly I use the co.nz version of Google. Okay, so Google bombards me with ads/search choices based on my searches but SFW? I've never bought anything and 95% plus of my "Google searches" are nuetral meaningless bs - sports, music, lyrics, reviews of films, games etc etc. Not exactly rivetting stuff there. DuckDuckGo's current failing for me is I don't think it's search results are as good. But I'll stick with it because apparantly it's getting better.