Long story re: my interaction with Pale Moon and Basilisk
There is only one thing I care about using WebExtensions for: Cookie management. I have yet to find a classic extension that provides the functionality I want.
Examples of two WebExtensions that do:
Chrome: Awesome Cookie Manager (Broken last I checked, but seems it's been updated): https://chrome.google.com/webstore/detail/awesome-cookie-manager/hcpidejphgpcgfnpiehkcckkkemgneif?hl=en
Firefox: Cookie Manager https://addons.mozilla.org/en-US/firefox/addon/a-cookie-manager/
The key function these provide is that they can save all cookies in the default or private browsing jars in a .json file and load them later. It's been exceptionally difficult to find any extensions that do this; most extensions billed as 'cookie manager' just give you a way to edit individual cookies, and the few with save/load functionality usually lack interaction with private browsing. Is there a legacy extension out there I've overlooked?
Also, if there's anything like the old Youtube Center that actually works for downloading videos that would be great; Given that Youtube has changed since Firefox killed extension support though, it would need to be a legacy extension that's still being developed. Do those exist? If so where can I find them?