More than likely the websites that you are viewing are making the connections to those 'social/ websites, even if you don't click a "share" button on the webpage.

By using an "adblocker" like AdBlock Plus or uBlock Origin you can install a "social fiterset" to block those connections. https://adblockplus.org/features#socialmedia

I believe this is a Firefox problem to solve, these sites are using the Firefox name. Are Firefox not interested in other sites using their name?

Please provide a screenshot of where you are seeing FIREFOX mentioned as related to those IP addresses.

See this support article. How do I create a screenshot of my problem? It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB.

Then use the Browse .... button below the Post a Reply text box to upload the screenshot.

Sorry that I didn't link this support article in my first response. https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections

the-edmeister said

Please provide a screenshot of where you are seeing FIREFOX mentioned as related to those IP addresses. See this support article. How do I create a screenshot of my problem? It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB. Then use the Browse .... button below the Post a Reply text box to upload the screenshot. Sorry that I didn't link this support article in my first response. https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections

Here is one screenshot with a few of the addresses. Thank you for your interest.