Dear Maintainer,
For several releases after version 17.0 Iceweasel upon launch and accessing comment forms spell checking defaults to the top most choice on the stack of Languages -> French (France). I select English (United States) which works for the session, but upon restart reverts to the aforementioned behavior.
It's either a spell-checking hook into Iceweasel or something specific to Iceweasel's preferences not reading locally configured preferences.
Perhaps the builder of the package defaults it to French?
Sincerely,
Marc J. Driftmeyer