browser does not support Mapbox GL

Which Ubuntu release are you running, which browser are you using? Details, please!

Lubuntu 18.04.6 LTS
i am using firefox web browser

Have you tried Chrome just to test?

What is the output of:

lsb_release -a; uname -a; apt-cache policy firefox

Thanks

Are you aware that standard support for Ubuntu 18.04 has already ended?
https://ubuntu.com//blog/18-04-end-of-standard-support

I havent tried using chrome yet , i will try that now

here is the output of lsb_release -a; uname -a; apt-cache policy firefox

a@a-Latitude-D420:~$ lsb_release -a; uname -a; apt-cache policy firefox
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.6 LTS
Release: 18.04
Codename: bionic
Linux a-Latitude-D420 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:29:48 UTC 2023 i686 i686 i686 GNU/Linux
firefox:
  Installed: 113.0.2+build1-0ubuntu0.18.04.1
  Candidate: 113.0.2+build1-0ubuntu0.18.04.1
  Version table:
 *** 113.0.2+build1-0ubuntu0.18.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages
        100 /var/lib/dpkg/status
     59.0.2+build1-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages

also i wasn't aware that standard support for Ubuntu 18.04 has already ended, i will do an upgrade and see what happens

Your output shows that you are running the 32bit variant of Ubuntu, which cannot be upgraded further.
Newer releases of Ubuntu are published only for the 64bit version.

You should check the capabilities of your CPU, maybe it is 32bit only.

What is the output of the command

lscpu

a@a-Latitude-D420:~$ lscpu
Architecture: i686
CPU op-mode(s): 32-bit
Byte Order: Little Endian
CPU(s): 2
On-line CPU(s) list: 0,1
Thread(s) per core: 1
Core(s) per socket: 2
Socket(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 14
Model name: Intel(R) Core(TM) Duo CPU U2500 @ 1.20GHz
Stepping: 12
CPU MHz: 798.098
CPU max MHz: 1200.0000
CPU min MHz: 800.0000
BogoMIPS: 2394.29
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 2048K
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts cpuid aperfmperf pni monitor vmx est tm2 xtpr pdcm pti dtherm

CPU op-mode(s): 32-bit

Your system is too old, you cannot upgrade it to a newer Ubuntu release.