@Ichirou2910 That is a browser feature, not something MD offers natively.
You can read more about it here.
I do believe the end goal of the devs is to make the site into a PWA, but that will probably take a while.
There are also 3rd party apps for Android like Neko & Tachiyomi.
@ss4chris
MangaSteam is dead, and I'm not part of any scanlation group, just uploading stuff. Btw those chapters were translated ~8 year ago, so doubt anyone else will pick it up.
And it is licensed see Amazon, but only physical edition.
@Arc27 Sure.
Grab Tampermonkey for your browser (Firefox, Chrome).
Go to the script page & click 'Install this script'.
A new windows will pop up in the Tampermonkey extension. Just above the the 'Source code' tab there are the 'Install' & 'Cancel' buttons. Click 'Install' & you're good to...