changed the default shortcut to make it work on Firefox

manifest.json

@@ -95,9 +95,9 @@
 	"commands": {
 		"_execute_browser_action": {
 			"suggested_key": {
-				"windows": "Ctrl+Shift+X",
-				"mac": "Command+Shift+X",
-				"linux": "Ctrl+Shift+X"
+				"windows": "Ctrl+Shift+Y",
+				"mac": "Command+Shift+Y",
+				"linux": "Ctrl+Shift+Y"
 			}
 		}
 	},