Remove/Replace Generic Header Signature Filter

[costes]

hi.
is there a way to remove or replace your browser Generic header signature with some type of filter?

after testing browser leaks at http://ip-check.info/?lang=en

i found out the generic signature of the browser remains the same even
if you have changed your user agent. which is pretty useless since you cant really mask your browser entirely. in other words if im using FF but i cloack the user agent as Safari this hash value will return FF and not safari ......is there a way to block / replace this hash value with proxo ? for example matching it to an "individual" user agent hash value of your choosing instead?