[bug] cannot use quote reply on firefox

[soumasandesu]

User Agent:
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:42.0) Gecko/20100101 Firefox/42.0 (quite old one)

can use clean reply? 👍
can use quote reply? 👎
can copy context and workaround for quote reply? 👍