You're welcome. :-) As these are things you run in your browser, rather than something supplied by the website, they do require you to know about them, but there's no cost involved.
The original * Savior was Tumblr Savior, which enables you to block posts on Tumblr that contain particular words or phrases. There's an AO3 Savior userscript on the page I linked to that does pretty much the same thing for the archive - one way of blocking stories from search results you don't want to read.
(By default AO3 search is very good at positive searches, but not so good at eliminating things you know you don't want, which is why people have created these unofficial ways of doing so.)
no subject
The original * Savior was Tumblr Savior, which enables you to block posts on Tumblr that contain particular words or phrases. There's an AO3 Savior userscript on the page I linked to that does pretty much the same thing for the archive - one way of blocking stories from search results you don't want to read.
(By default AO3 search is very good at positive searches, but not so good at eliminating things you know you don't want, which is why people have created these unofficial ways of doing so.)