Would be 5 stars, except it does not read my ao3 history so im still accidentally rereading the starts of fics before i realise :(

This extension is not necessary if you have a user account with archiveofourown. Just click on Dashboard and then on History where you can see a list of the stories you have already read since the beginning of your registration.Nevertheless, this is a top extension for all those who do not have a user account.