No Script - Yes, I run both UBO and NoScript, they have slightly different use cases
Dark Reader
FireFox Multi-Account Containers
Redirector - Great for automagically changing links
KeePassXC-Browser - For password manager integration
Rested - For monkeying with REST APIs
User-Agent Switcher and Manager - Why yes, I am the browser you are looking for
Video DownloadHelper - Because sometimes, you need stuff available offline
In terms of actually recommending extensions to others. I'd recommend most of the above, excepting NoScript. If you are using UBO, then the use case for NoScript is a very narrow one where you want selective whitelisting of javascript while visiting a site. UBO's blacklisting approach works for most cases and UBO's whitelisting feature is lacking the granularity of NoScript.
I use Dark Reader on my work laptop was well. We had a conference call with a vendor and I was sharing my screen while talking with their team about our usage of their product and one of them stopped me and asked about the UI looking strange. I said, "oh ya, I use Dark Reader because you don't have a native dark mode. You do lose points for that." They had a native dark mode a couple months later.
I've come to the conclusion that UI designers hate their customers' retinas.
Multi-account containers is one of my favorite things about Firefox. I use Temporary Containertabs too, so anything not in an explicit container is in a brand new one of its own.