Maybe something like zensurf? You can go into the text file and add anything you want the script to change or delete anything you don't want it to change so long as you keep the "WordIDontWantToSee":"WordIWantToSeeInstead", format. And then under the script settings set the included pages to "http://archiveofourown.org/*" and "https://archiveofourown.org/*" if you only want those words replaced on AO3.
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Date: 2014-10-25 05:03 pm (UTC)