* Browser written in a way that prevents most exploits.

* Built-in Javascript and cross-domain request blocking.

* Single-process sandboxed browser where only the active tab is allowed to run.

* Tab content written to disk so it can be restored in the event of a crash or running out of battery.

* Ability to "swap out" tabs to disk so they consume no memory.

* Ability to freeze all javascript code on a tab temporarily.

* Deep searching of history (i.e. page content).

* Created by a privacy-friendly organization/people who aren't trying to spy on you.

* Avoid doing things automatically (download files to a folder, search for misspelled URLs, send URL to Google when typing it in, etc). Don't have keyboard shortcuts that are hard to undo (also, don't have single-key letter/number shortcuts at all).

* Don't have an over-engineered build process. The browser should be possible to build (not necessarily fast) on an old or low-end computer.