The extension is really good and adds a ton of useful addons to the site that make it a hundred times easier to create projects, customize the site in the way you want it, make navigating the site easier, and so much more. If this extension didn't exist it would take forever to make things. The only problem is that sometimes after having the extension installed for a certain amount of time, all addons enabled would stop working randomly with the extension being completely broken while infinitely loading with the only fix being deleting and reinstalling the app. Other than that the app is amazing for Scratch and I do recommend it as it makes basically everything a lot more convenient with the built in addons.