You can replace a word by simply typing the word before and the word after in the form.
There is no need to refresh the page. Press the Save button and it will replace the words in real time.
You can also delete the word before the replacement by leaving it blank.
It also supports dynamic sites such as Twitter.
I was very particular about “not showing the word before it was replaced, even for a moment,” so you probably won’t see it for a moment.