Problems

1. If you install LibreWolf from their website, you may default to installing the x86_64 version, which will have a performance hit.

2. Since LibreWolf has not signed their binary, macOS will force you to do many things just to launch the app.

Solutions

Install Brew:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Install LibreWolf, forcing arm64, and without quarantining:

arch -arm64 /opt/homebrew/bin/brew install --cask librewolf --no-quarantine

Verify arm64 LibreWolf:

file -b /Applications/LibreWolf.app/Contents/MacOS/LibreWolf

Result should be:

Mach-O 64-bit executable arm64