Many of the essential privacy extensions for Firefox are from the same developers who made their Chrome counterparts, and they work in similar fashion.
Adblock Plus : http://adblockplus.org/en/
Ghostery : http://www.ghostery.com/
Do Not Track Plus : http://goo.gl/ChGjJ
NoScript : http://noscript.net/
Priv3 : http://priv3.icsi.berkeley.edu/
We'd say Ghostery, AdBlock Plus, and Priv3 are the essentials here.
Do Not Track Plus and Priv3 cover some of the same territory, so you can go either way there, and as with Chrome, NoScript is for advanced users looking for more granular control.
Firefox's "Do Not Track" feature is worth enabling as well, even if many sites circumvent it with well-placed cookies and social plug-ins that are all but required if a site wants a social media presence or solid placement in search results these days.
Additionally, make yourself familiar with Firefox's privacy and content settings. As with any browser, we suggest you log out of services when you're finished, and set Firefox to clear your private data, cookies, and browsing history when you close the browser.
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