Im Using Raspberry Pi 3B+ with Raspbian Buster (Debian version: 10)
- On Terminal: ${HOME}/.config/chromium/Profile 3/Preferences
cd ~/.config/chromium/Profile\ 3/
in my case, Profile 3 appeared. please check your own folder
- then do nano on Preferences file to edit file
nano Preferences
In this file, set the "update_url" property to something invalid like "https://localhost" or 127.0.0.1
for example. For the given url, it makes auto-updating that extension as simply impossible.