gngr

It loves html & css but is sceptical about cookies, scripts and plugins
Cookies and scripts are supported but are disabled by default. They can be enabled for trusted sites. There are no plans for plugins yet.

Its internal modules are firmly sandboxed
For example, the css module can't access your filesystem nor can cookie code access the network. This is in addition to the sandboxing and same-origin policies of a typical browser.

It is built with a high-level language and runtime (Java)
We believe this choice can improve stability and security since high-level code is easier to write and audit.

Not yet. Speed is lower priority in the current development cycle.

Nope; we don't think so. Most Java run-times perform very well for long-running applications. It might consume more memory though.

See here