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I use Facebook, but I don't want them to know which other sites I visit. I've seen it happen, was logged in to FB, then visited another website to order something, and now I see the ads from that website suddenly appear in FB. Every site that has a FB button, loads that button from FB, so they know which sites I visit. <br />
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Firefox is my primary browser. For the moment I've solved this by using Safari for Facebook only, but I would prefer to use Firefox all the time.<br />
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Is there an addon or some other way to block FB images and FB javascript from being loaded when I visit another website? 
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I use Facebook, but I don't want them to know which other sites I visit. I've seen it happen, was logged in to FB, then visited another website to order something, and now I see the ads from that website suddenly appear in FB. Every site that has a FB button, loads that button from FB, so they know which sites I visit. 

Firefox is my primary browser. For the moment I've solved this by using Safari for Facebook only, but I would prefer to use Firefox all the time.

Is there an addon or some other way to block FB images and FB javascript from being loaded when I visit another website? 

Prevent Facebook buttons to load on other websites

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Spyware is software that aims to gather information about a person or organization without their knowledge and that may send such information to another entity without the consumer's consent, or that asserts control over a computer without the consumer's knowledge; it has also come to include programs that engage in various kinds of electronic fraud. Anti-spyware is software that removes or blocks that software; some common vendors include Malwarebytes, McAfee, Spybot-Search and Destroy, Ad-Aware and BitDefender.