if [[ ":$MOZ_GMP_PATH:" != *":/var/lib/widevine/gmp-widevinecdm/system-installed:"* ]]; then
    MOZ_GMP_PATH="${MOZ_GMP_PATH}${MOZ_GMP_PATH:+:}/var/lib/widevine/gmp-widevinecdm/system-installed"
    export MOZ_GMP_PATH
fi
