√ Verified to work with Chrome, Chromium and Brave
I've successfully installed and am running Reaper in Chrome, Chromium and Brave. I'm won't be testing other Chromium variants (such as Opera). But I expect it is safe to assume Reaper installs and runs fine with them as well. Go for it!
NOTE: With Brave you have to change the command "chrome://***" to "brave://***" when setting up and installing Reaper. The regular "chrome://" command works fine with both Chrome and Chromium.
Thank you NIST! If only the rest of my US government paid heed to your computer security recommendations!