For controlling a browser you could look into the extension MozRepl https://github.com/bard/mozrepl/wiki. It gives you a read-eval-print-loop for evaluating javascript code. It is used for example by the WWW::Mechanize::Firefox module. I have not used it myself, but the documentation sounds as it should be possible to control a browser canvas externally.

In reply to Re: The browser as a (simple) window manager. (Updated) by chb
in thread The browser as a (simple) window manager. (Updated) by BrowserUk

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