Dang, was hoping vertical tabs would be in it when I seen the nice round 130. I have been trying out Zen browser which seems to be a fancy Firefox skin that has virt tabs and they seem awesome.
The sidebar is present, but no tabs just yet. The only way I was able to activate the sidebar was changing the chatbot from settings, not sure how to toggle it without doing that.
This is an example of a tab group using Sidebery. If you click links on a page that open in new tabs, it creates a sort of folder from the original tab, with the group of links as children of the parent tab. You can also drag them into these groups manually.
You must've gone out of your way to run an obscure OS if you can't run Firefox on it...
And in choosing a super obscure OS, you probably knew software compatibility would be an issue. In other words, kind of a problem of your own doing, and not related to Linux either.