Surf supports Flash quite well.
Its simplicity is mostly a security advantage. Simplicity is security , after all -- and it's an important part of open source security in particular.
The simplicity of its interface is a bit of a problem, however, because it is not configurable in any reasonable sense to tighten security according to your usage needs. It also does not have an extension system, which means that security extensions such as HTTPS Everywhere and Perspectives are essentially impossible for Surf.
In short, there are trade-offs.
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