That's not a firefox issue but user caused. You need to backtrack and see what you did prior to this happening to see what you clicked to install that caused this issue.

I don't see how it is user caused, i use two extensions only. ublock origin and canvasblocker and that's all. I use them in another browser aswell which doesn't connect to buypass.com

To be clear, when i say as soon as i open firefox it connects to buypass.com i dont mean that it opens a tab and visits the website, no that's not what i ment. Buypass.com is an active background connection just like mozilla.com, mozilla.net, firefox.com, cloudfront.net, mozaws.net, and digicert.com These connections are established as soon as firefox.exe is opened. I don't see why buypass.com is in that list. It might be user caused, but then i don't know how/why that happens, like i said i only use two extensions and that's it.

Where are you getting that information (the list of sites the browser is connecting to)?

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