The Sidebery extension is the key, for me. Tabs are vertical, hierarchical, and searchable.

I also set the color of specific tabs (another Sidebery feature) that have some special returnability reason. I don't love the color options, nor the default ordering (would prefer the more traditional color spectrum order (red-blue or inverse) so that I could infer the tag/priority/etc from the color, but I only use a few colors and it's fine.

I don't have a problem with duplicates. If it's a page/app that I return to often, I know that and just jump to it. I'm sure I have some dupes hiding in there though. NBD.