Try like that, i'm not great in lua, but in my code there isn't round bracket after data:extend

data:extend{
{
type = "technology",
name = "firearmor",
icon = "__FireArmor__/graphics/tech/r.png",
icon_size = 16,
effects =
{
{
type = "unlock-recipe",
recipe = "fire-armor"
},
},
prerequisites ...