Hey, let me know if that is a duplicate (searched for it, found nothing) or already exists.
The ideia is pretty simple: a way to flick all the extensions ON/OFF without going through private window. Let's say you have a lot of extensions and some website you are using are not working properly for some reason, sometimes extensions such as blockers can cause websites to malfunction due to some JS blockage. A way to disable extensions quickly can allow users to make the website function as normal without having to manually going through Manage Extensions > (disable one by one). Of course that is just an example but would still be quite convienient to have such option. Thanks 🙂