Hey rarepair shippers, I'm about to change your lives.
The AO3 Primary Ship Search add-on for Firefox (it's called AO3 First Tag Search for Chrome) adds this little checkbox to the AO3 advanced search page
And if you check the box, the search only returns fics where the pairing you entered is the first one tagged. This is better than the otp:true operator imo because it will show fics with secondary/background pairings too as long as your preferred ship is the main one.
You can even use the add-on in Firefox or Kiwi browser on Android mobile.
Have fun 😘
(more ao3 tips here)
