This effect is difficult to achieve.  The only way I can think of to
do it is with an iframe to a domain your control.  You can also use an
iframe to a data URL if you don't want to involve a server.

Adam


On Thu, Jan 7, 2010 at 4:22 PM, Min Huang <[email protected]> wrote:
> Hello, I would like to inject content into a webpage's DOM; however, I
> do not want said webpage to have access to any of the injected
> content.  There is a means of doing this in Firefox via XBL and
> anonymous content (eg the file input element is composed of a text
> input and a button input, but the individual text and button inputs
> are not accessible directly).
>
> If this is not possible, I would be happy with some mechanism to
> overlay content onto a webpage or the browser (similar to how XUL
> panels work in Firefox).
>
> Can anybody help?
>
> Thanks
>
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