This panel gives you the ability to quickly edit the opacity of multiple layers at the same time, using a graphic interface. It is especially useful for those who works with hundreds of layers at the same time, like, for instance, while working on star trails or clouds stacks. Here's a quick video on how to use opacity editor to edit your star trails: https://youtu.be/VFvxnQ_i-Gk

Trial Version. Number of clicks limited to 3

Navigate to Windows -> Extensions to find ”Opacity Editor”