Direct answer
use
links -no-connect <websiteURL>
Or
links -anonymous <websiteURL>
On one or both monitors to prevent the sharing of cookies*
explanation of claim above
I believe
-anonymous
would prevent disk cookies altogether and
-no-connect
will launch it as if the other didn't exist (if I am understanding "separate instance" correctly in terms of a web browser)
links is my go to browser, ill experiment
logging into my email now
quitting
links yahoo.com
doesn't prompt sign in
going tty2:
Confirmed normal Opening doesn't require login again.
links -anonymous yahoo.com
does prompt login
again confirming
links yahoo.com
does not without options
links -no-connect
does prompt login
It's not hard proof, but we cannot conclude that no malicious cookies are preserved, however both
-anonymous
and
-no-connect
options have
links
launch browsers unaware of at least some, I'm guessing all , of the users cookies not generated within them.
As shown using the login cookies of yahoo mail
TL;DR
there are options (see
man links
)
-anonymous
And
-no-connect
Which do prevent sharing of cookies.*
*I cannot say they prevent any sharing of cookies, but as shown above they do prevent sharing of at least some cookies,
I am avoiding an unearned conclusion (the difference between "for all" and "for some" can be tough for some, if anyone can improve on my answer please do. But I did answer the question (how to prevent separate windows of links from sharing cookies) if it was meant to be "how to prevent separate windows of links from sharing any cookies, my quick expiriment and understanding of the man page is insufficient. I would love for someone to guarantee the options act as it would seem for all cookies, for any site. I assume they do, but this is all I have to offer
Maybe I need to add,
use
links -no-connect <websiteURL>
Or
links -anonymous <websiteURL>
On one or both monitors to prevent the sharing of cookies*