Oceniono na 3 z 5 możliwych gwiazdek

1. "The button in main tollbar has to be added by customizing the toolbar"
2. "The button in message header pane has to be added by customizing this toolbar."

#1 here above can be added, #2 can not, no View HTML button found in the compose window. Is this a bug? Win 8.1, Thunderbird 45.0

Follow-up: I stand corrected. I mixed up message window with compose window. Sorry, I am very new to Thunderbird (2 weeks). The addon works, but this was either way not what I hoped the addon would do.

Ta opinia jest o wcześniejszej wersji dodatku (3.7.4). 

There has never been a button in compose window. This addon and its buttons are thought for reading messages - not composing.