Earlier quoted context omitted.
Bookmarks and tabs are there already in all major OSS browsers.
Bookmarks and tabs are far from being easy, solved problems. For example adding a Firefox addon to display tabs vertically in a tree structure instead of a horizontal list has changed the way I use the internet (and I have always used a lot of tabs). In the end tabs are just like booksmarks, except that they keep state during a browsing session. I find it very weird that we keep those very similar concepts in complet…
Sounds interesting, which extension would that be?