For me, too late, because my workflow is already full of little pandoc scripts that do document conversion wherever I need it! But I wonder if the killer app m

For me, too late, because my workflow is already full of little pandoc scripts that do document conversion wherever I need it! But I wonder if the killer app might be a browser plugin, not a website. Highlight text on any webpage, convert it to whatever. Saves the copy-paste, and hopefully stays on the local machine.