Added showPresetsOnInstallation

Fixes #656

lib/main.js

@@ -170,8 +170,12 @@
 			case "install":
 				logging.message("CanvasBlocker installed");
 				openOptions(details.reason);
-				browser.tabs.create({
-					url: extension.getURL("options/presets.html?notice=" + details.reason)
+				settings.onloaded(function(){
+					if (settings.showPresetsOnInstallation){
+						browser.tabs.create({
+							url: extension.getURL("options/presets.html?notice=" + details.reason)
+						});
+					}
 				});
 				break;
 			case "update":

lib/settingDefinitions.js

@@ -414,6 +414,10 @@
 			defaultValue: "auto",
 			options: ["auto", "default", "light", "dark", "colorful"/*, "none"*/]
 		},
+		{
+			name: "showPresetsOnInstallation",
+			defaultValue: true
+		},
 		{
 			name: "dontShowOptionsOnUpdate",
 			defaultValue: false