If you mean what I think you mean, you can already send a link that specifies a valid element ID on the page to anybody and have their browser focus on it — that's what fragment identifiers are for. However, if the page designer has neglected to provide a unique ID for each page element (and they probably have), you're out of luck. Ideally, you'd be able to specify any valid CSS selector that only selects one element as a fragment identifier, but that's not the case (and is basically what this extension makes possible).