Description:
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A major bug that only effects Gecko browsers (e.g. Firefox, Waterfox) refuses to remember the session across page loads. As my software requires a session to view pages visitors afflicted by this bug are unable to access the website at all. In the interim I have setup an error-handler page explaining the technical issue along with displaying the session id so they can see the issue. Most people reload the page until they pass the system tolerance level and they get a nonrelated error for up to half an hour. If you are thoroughly testing the issue I highly recommend a VPN that can generate a lot of different IP addresses to avoid having to wait to resume testing once you've exceeded the system tolerance.

This can be tested at jabcreations.com only with Gecko based browsers.

I have not been able to determine the exact cause of this as this issue as it appeared in the middle of a major project though the issue has naturally gotten progressively worse.

Test script:
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PHP script initiation:

ini_set('session.cookie_secure', 1);
ini_set('session.gc_maxlifetime', 3600);
session_set_cookie_params(3600);
ini_set('session.cookie_httponly', 1);
ini_set('session.cookie_samesite','Strict');
ini_set('session.use_only_cookies', 1);
session_name('session');
session_start();


php.ini settings:

[Session]
session.save_handler = files
session.save_path = "/tmp"
session.use_cookies = 1
session.use_only_cookies = 1
session.auto_start = 0
session.cookie_lifetime = 1800
session.cookie_path = /
session.cookie_domain =
session.serialize_handler = php
session.gc_probability = 1
session.gc_divisor = 1000
session.gc_maxlifetime = 1800
session.bug_compat_42 = Off
session.bug_compat_warn = Off
session.referer_check =
session.entropy_length = 0
session.cache_limiter = nocache
session.cache_expire = 180
session.use_trans_sid = 0
session.hash_function = 0
session.hash_bits_per_character = 5


Expected result:
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Sessions should not mutate or be lost.

Actual result:
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Gecko browsers mostly forget the generated session and therefore every single request a new session is generated.