This is a fork of an old version of Einar Egilsson's Redirector extension for use in Pale Moon.
Description of the extension from his website:
The add-on lets you create redirects for specific webpages, e.g. always redirect http://bing.com to http://google.com. It was originally done by request for someone on the Mozillazine forums. The redirect patterns can be specified using regular expressions or simple wildcards and the resulting url can use substitutions based on captures from the original url. The add-on can for example be used to redirect a site to its https version, redirect news paper articles to their print versions, redirect pages to use specific proxy servers and more.