Very useful for replacing CDNs when they're not available.

An example which may help someone:

Format: %https%//cdn.jsdelivr.net/npm(.*)
Destination: %https%//unpkg.com\1

Replace "%https%" with "https:"

Appears to work fine for URLs in image src tags as well

Works well, but lack of examples/documentation means that you have to experiment a lot before getting it to do what you want.

Works well with correct syntax.
E.g.
https://www.reddit.com/(.*)
-->
https://new.reddit.com/\1

Works as advertised.

This Firefox addon (and its code) does exactly as described! No-frills redirect for user-specified domains that need redirection.

doesnt work

類似のアドオンの中では一番うまく動きましたが、サイトによっては失敗します。
https://www.reddit.com/(.*) ---> https://old.reddit.com/(.*)

It works for me. It could provide better manual and more examples.

Does not work

doesn't work

Doesn't seem to work. https://github.com/duangsuse/WebExt-URLReplace/issues/3

Шикарно работает! Заменяет не только в адресной строке, но в коде страницы.