Good call.
Hello, if you did it with notepad, then it shouldn't be a problem as said above.
To be sure the code is read you can put the method in a self invoking function. Then add something to the console log to check if the plugin is at least working:
Code:
(() => {
console.log('hello')
SceneManager.snapForBackground = function() {
this._backgroundBitmap = this.snap();
//this._backgroundBitmap.blur();
};
})();
Then launch the game and open the console with F8, see if 'hello' is writen. If yes means that the plugin work, but not the method (probably because of some other plugin using the same method as suggested
@ATT_Turan). If not, then it means the plugin isn't recognized for whatever reason.