Fire Vox will announce when a JavaScript alert box has appeared and automatically read its contents. If you would like for Fire Vox to repeat the contents, press CTRL + Shift + P. To focus on the first button that is available, press CTRL + Shift + F. If there are multiple buttons, you can switch betweeen them by using Tab.
Since Fire Vox does not rely on pre-parsing web pages, it can handle dynamic content that is added using inner HTML. If this dynamic content is to appear earlier in the page than the button which causes it to be created, web developers can alert users to the presence of this new information, as well as provide easy access to it, by creating a link to this new content after the button.