As part of my work, I sometimes I need to redirect links to a local installation of a web app, so I can debug a particular issue.

For example, I might receive an email with a link to but I want to see what happens with the code running at http://localhost:3000/what/ever?thing=stuff. For a while I’ve been copying the link, pasting it, manually editing it, and carrying on. But I thought there had to be a better way.

It turns out Einar Egilsson’s Redirector extension is a better way. Install it in your browser (Firefox is my daily driver) and add a redirect like so:

Include Pattern:*
Redirect to: http://localhost:3000/$1

So when the redirect is enabled, any links to will be redirected to localhost:3000. Thank you, Einar!