Ubiquity for Firefox. It was an overlay that let you type commands to use and combine web services using natural language. It understood pronouns, so you could highlight text and say "map this" and it would look up the selection in Google maps. You would subscribe to command feeds that could be updated automatically for bug fixes or to keep up with changing APIs. By the time the project was abandoned, it had an advanced language engine with noun or verb autocomplete in multiple languages including different subject-verb-object orders.

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