Currently the only supported browser engine is Internet Explorer. Support for Chromium and Gecko will be added in a future update.
This feature is currently experimental and not feature complete
Interactive options are not supported, for example clicking nodes in a dynamic tree or scrolling a page which uses infinite scroll. There are no plans to add support to allow for user interactions to be dynamically performed.
Note that this still does not provide privileged access to a webserver, it is still not possible to download the raw source code of a website or its back-end databases unless the website specifically allows for this.
As noted, this is currently experimental. Future versions of WebCopy will include options for choosing between specific versions of Chromium or Gecko.