Thank you, this is excellent! Works very well for my testing, it is super useful for pairs that are often tagged as side couples.

As some others mentioned, it would have been awesome to also implement a checkbox on filtering view, but I get that this is not easy. I'd also love version for Google Chrome, but there's no problem to pop-in Firefox, search for whatever I want to find, and read it in Chrome.

I do not understand why AO3 does not have this natively, but it's a major improvement.

Works as expected, took me a minute to figure out that you had to go through the actual search function rather than the filter sidebar. Would be cool if there was a checkbox there as well, as I think most people use that more often than the search feature. :)