Adone Acrobat Add-on on Browsers

Hi

My FireFox browser version is 80.0.1  64bit and is up to date ,and my Chrome version is 85.04183.83

my OS is Windows 10 64bit version 2004 and up to date.

my problem is when I completely install adobe acrobat DC Continous and install all my flash players

there is no news about adobe acrobat add-on in my browsers like 2 years ago.

now I install new windows on my PCs and old method which I used to install this add-on not work.

I uninstall all products several times and then install again by changing the sequences .the result is same and no icon appear , even when I go to extension menu there is no gray out option to enable it.

please advice me what should I do to have this add-on , does the installation rule change or this add-on remove completely ?