1. A computer system comprising: one or more computing devices; a hotword manager on the one or more computing devices that is configured to maintain information for a plurality of hotwords that correlates identifiers for the plurality of hotwords with respective representations for the plurality of hotwords; a hotword detection module on the one or more computing devices that is configured to listen for spoken input and detect when spoken input corresponds to one of the plurality of hotwords; and a browsing application on the one or more computing devices that is configured (i) to parse an electronic document to identify respective identifiers for one or more hotwords included in the electronic document, (ii) to generate a display of the electronic document that includes respective representations for the one or more hotwords, the respective representations obtained from the hotword manager using the identifiers for the one or more hotwords included in the electronic document, and (iii) to perform a particular set of operations in response to identifying spoken input for a particular hotword included in the electronic document.