I wrote a script which acts much like search and replace in standard text editors like notepad or word.
You can find it here. https://www.pixelvaria.com/search-replace-script/
Just start the script and you will be greeted with the 1st menu.
Type the layer name you are searching and hit search.
Then you get a 2nd menu which shows you how many search results there are.
Just in like any editor you can navigate up and down with hitting next.
You can also replace the selected word, or all of them.