Firefox addon - how to listen to a text highlight event in a webpage

I am writing an addon which needs to do capture the no of times someone has highlighted any tex开发者_运维百科t on a webpage. Is there any way I can listen to this event?

Thanks, Kapil

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There is not a particular event for this. But you can listen to the mouseup event and check whether the selection returned by window.getSelection() is not empty and/or whether it differs from the previous selection.

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You could add a selection listener. The Source window (viewSource.js) does this so that it can keep the row and column number up-to-date.