fira-code-mode.el

;; Enable the www ligature in every possible major mode
(ligature-set-ligatures 't '("www"))

;; Enable ligatures in programming modes
(ligature-set-ligatures 'prog-mode '("www" "**" "***" "**/" "*>" "*/" "\\\\" "\\\\\\" "{-" "::"
                                     ":::" ":=" "!!" "!=" "!==" "-}" "----" "-->" "->" "->>"
                                     "-<" "-<<" "-~" "#{" "#[" "##" "###" "####" "#(" "#?" "#_"
                                     "#_(" ".-" ".=" ".." "..<" "..." "?=" "??" ";;" "/*" "/**"
                                     "/=" "/==" "/>" "//" "///" "&&" "||" "||=" "|=" "|>" "^=" "$>"
                                     "++" "+++" "+>" "=:=" "==" "===" "==>" "=>" "=>>" "<="
                                     "=<<" "=/=" ">-" ">=" ">=>" ">>" ">>-" ">>=" ">>>" "<*"
                                     "<*>" "<|" "<|>" "<$" "<$>" "<!--" "<-" "<--" "<->" "<+"
                                     "<+>" "<=" "<==" "<=>" "<=<" "<>" "<<" "<<-" "<<=" "<<<"
                                     "<~" "<~~" "</" "</>" "~@" "~-" "~>" "~~" "~~>" "%%"))

(global-ligature-mode 't)

(provide 'fira-code-mode)