An automatic stovetop fire suppressor with sensor triggered activation and method are provided herein. A combination of sensor types is housed within a self-contained fire suppressor, collecting data from the stovetop environment. Sensor types include temperature, light, and infrared. The fire detection method affords expedient fire state determination with discrimination from changes in ambient light, camera flashes, and non-fire heat sources. A bottom lid is secured to a bottom of a can, forming a closed container. A fire suppressing agent is housed within the closed container. From sensed data, the presence of a stovetop fire is assessed. When a fire condition is determined, an electronic match triggers a mechanical shuttle. The fire suppressing agent and battery power are stored in the closed container from manufactured end to activation of the suppressor in a fire condition.