Comment 35 for bug 1741074

For Ubuntu 20.04, I have also noticed that both snap installed Chromium and Brave Web browsers fails to work with the gnome-shell-integration extension.

In the case of Brave, this issue can be overcome by following their instruction on installing the .deb versions of brave-browser and brave-keyring files.
$ sudo apt install apt-transport-https curl
$ sudo curl -fsSLo /usr/share/keyrings/brave-browser-archive-keyring.gpg https://brave-browser-apt-release.s3.brave.com/brave-browser-archive-keyring.gpg
$ echo "deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main"|sudo tee /etc/apt/sources.list.d/brave-browser-release.list
$ sudo apt update
$ sudo apt install brave-browser

However, the chromium-browser does not have a .deb version to fix this issue. If one does issue the command:
sudo apt install chromium-browser,
this command will instead instruct snap to install chromium.

Hope the Chromium developer community can fix this issue given it was first reported in 2018-01-03. Chroumium adoption would be made easier too. Thank you.