Ah, I’ve been there too! Switching from Firefox was definitely a challenge. What worked for me, at least as a workaround, was combining Tab Manager Plus with Workona. It’s not quite the tree view you’re used to, but it does help organize your tabs in a way that’s manageable. It’s not perfect, but it’s a decent solution.
Honestly, I don’t think we’ll get a true Chrome extension that replicates Firefox’s Tree Style Tab until Chrome’s extension APIs allow for more control over tab structures. For now, I’m afraid Firefox still holds the crown for this feature.