[macOS General] Homebrew: brew doctor で Error: Failed to import が表示された場合の対処

% brew doctor
Error: Failed to import: firefox-esr-us
No available formula for firefox-esr-us
Your system is ready to brew.
% brew prune
Pruned 1 dead formula
Tapped 2 formula
Pruned 0 symbolic links and 2 directories from /usr/local
% brew cleanup
% brew update
Already up-to-date.
% brew tap --repair
Pruned 0 dead formula
Tapped 2 formula
% brew doctor
Your system is ready to brew.