Histcontext lets you see the surrounding history for a webpage you've visited in the past! You can also see all past recorded visits to a webpage. This WebExtension has only been tested on Firefox. Ideally it would show the context you in the browser's history window – unfortunately I don't think that's possible with WebExtensions, so the UI is based on a toolbar popup that lets you browse your history.
PRs welcome. The code is a bit hacky and UI-centered...
The latest version is 0.9.0. Download from releases or from AMO.