If you need to set up your own redirect when visiting certain sites, then you should install the Redirector extension.
This is autotranslated version of this post.
Redirector is an extension for Firefox, Chrome and Opera that will help you set up redirects for specific pages.
For example, instead of
http://example.com/foo.html always opening
http://example.com/bar.html. This can help to automatically skip messages about successful registration or posting, advertising pages, or redirecting from http to https.
Of course, you can always customize your own rules using masks. For example, the mask
^(http?s://)(.*\.)m(?:obile)?\.(.*will automatically open the full version of the site, instead of the mobile one.