This seems to do what you want, but it looks a bit hackish and hasn't been updated in a while: https://addons.mozilla.org/en-GB/firefox/addon/pinstripe-pinned-tab-sidebar/
this post was submitted on 27 Dec 2022
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Interesting, let me try this
This seems like an interesting idea. I suppose you want something like Vivaldi Browser sidebar web panels, right? Sadly, I do not think I have ever seen any popular addon adding this feature. I will have to look around whether I can find someone working on the idea further.
I suppose only part of Vivaldi web panels, I am ok with pinned tabs opening in full view when clicked, just want them on left sidebar. What I'm trying to solve: I've plenty of tabs pinned (email, nextcloud, mastodon, element, pixelfed, home assistant, lemmy etc.) that leaves very small space for normal browsing - more than 3 tabs makes it harder to keep track, so I'm trying to see if pinned tabs can go somewhere else
Oh, that is right. I did not realize what Vivaldi does is that it opens the panel inside the sidebar only. It has been a while since I have seen Vivaldi. I have around 15 tabs pinned at all time as well. I think I would appreciate the described feature, too.