Thank you Banfa.
If the duckduckgo.com browser is open source what version is non-calling-home. Otherwise I like Firefox 43.0b9 as it is open source and I can go through the source and edit (change) what I want as I want.
I know a security programmer that has been using Firefox for their browser and duckduckgo.com for their main search engine. They like the results. But, they use some adjustments that others might find useful.
They set Firefox to remove all history and cookies each time that it completely closes. That might take some getting used to and they have a short list of bookmarks like to bytes.com, etc.
If they want to close Firefox and reopen it with ALL of the tabs and web pages returned to current status, they can close Firefox via control/alt/delete and force it to crash closed which then Firefox saves all the tabs and web page urls and when they re-start Firefox it gives them the option of reopening the pages one at a time. That way then the cookies and history are cleaned the next time that they tell Firefox to shut down itself.
With duckduckgo.com they can do a lot of searching, and get a high percentage of what they want, but if they really can not find something, they occasionally have used Google and then manually cleared the cookies and history before the next Google search. They have found it advisable to defragment all drives used for browsing and browsing related activities at least once per day and occasionally every 30 minutes. Security is worth far more than the price of replacing drives.
But, if someone has beyond XP Pro sp2 or beyond 7 sp1, or any version of Windows 8, 8.x, 10, etc. then I guess that for most people their best option is a third party (exterior and independent) hardware (locally to itself configurable) firewall.
For the average person, if they have common UEFI, or common TPM, etc., then it looks like that exterior firewall is required or else the non-calling-home browser and the defragments are a waste of time.
Generally, they show up on the internet as someone new, search for coding stuff, etc., then disappear. Hearing of them might have lead me to ask about non-calling-home browser versions for my own use.
Maybe I might find here posting of further info answering: What are the latest versions of browsers that do not have "call home" built in?