- securely shares passwords across multiple hosts (emphasis on 'securely,' unlike Chrome and Firefox)
- blocks ads
- blocks JavaScript, but makes it very easy to selectively enable it
- supports <script type="text/python">, <script type="text/common-lisp"> and <script type="text/smalltalk"> (hey, you did ask for ideal!)
- written and extensible in Common Lisp (elisp or Python would be minimally acceptable): the goal here is to be able to have 'the emacs of web browsers'