a feature that I've loved about Vivaldi (and vimium on chrome) is the spotlight like search for tabs. When you run a lot (~30-40) of tabs, that's an killer feature right away!
Aside from the fact that the regular URL bar in Firefox does this, Tab Center (https://github.com/bwinton/TabCenter) puts tabs on the side with a filter-search at the top.
The search and hide/unhide function seemed interesting to me, but in my opinion the Tree Style Tab add-on is superior. Perhaps that is because TabCenter is aimed at a less technical audience [1].
Hierarchical tab structures are more valuable in my opinion, because it implicitly groups related tabs together. The structure in which tabs are opened reflects my workflow while opening them and allows me to e.g. close all tabs that were related to a certain problem. It does however lack a search function and some sort of versioning, as I find my tab-bar clutter over time. Perhaps a aging approach could be helpful for me, but I have yet to come across something better than Tree Style Tab.
This is brilliant! I wasn't aware of tab center. The best part is that it works really well with tabgroups too.
However, I am unable to use it through the keyboard. The undocumented C-S-l seems to trigger a search over there. But there is no way of navigating to a matching tab without the mouse. Any tips?
Pentadactyl for Firefox also allows that (press 'b') and it's absolutely amazing. Way quicker than searching for the tab visually and manoeuvring the mouse to it on a notebook.