Grail is an extensible WWW browser implemented in Python, an interpreted object-oriented programming language. Grail can be extended on a permanent basis with components downloaded from a trusted site, or experimentally with components that are not necessarily trusted. Untrusted components execute in a restricted execution environment which limits their ability to damage or spy upon their host environment, without slowing them down or limiting their functionality significantly.
Permanent extensions can add functionality to the browser such as
Extensions are downloaded in source form. In the future, downloading of extensions in more easily digestible byte-code form will be considered. Pure binary extensions may also be considered, but should only be downloaded from trusted sites.
The current release is a beta test version which supports applets but not the other forms of extensibility listed above. It has limited security features.