> Tabs aren't just navigation history; they're curated, temporary history. Unworthy of the permanence of bookmarking,

You might enjoy this?

https://addons.mozilla.org/en-US/firefox/addon/toomanytabs-s...

https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...

Also, the person who thinks 30 tabs is a lot should get a look at what I do to myself:

http://heybryan.org/shots/2008-01-15-tabs.png