Worked perfectly for me. Thanks, kawamataryo!
The initial login experience is bad though.
To the people saying it doesn't work:
- Make sure to open your Twitter following page.
- Make sure to use a temporary Bluesky "app password".
- Make sure you copied the full password without any extra characters like space (check it in the notepad).

Perfect. Did exactly the job I needed and helped me prune down twitter-following to what I can't unfollow/isn't mirrored, thanks

it works. a bit finicky, and you do need to reset the page and log in again if you stop the process, otherwise it won't load all your followers. still, it does the thing it sets out to do, and does it well

Awesome, does what it says

If you are looking for an easy to way to find your Twitter/X followers on BlueSky, this extension is very handy.

Latest update (1.0.6) is a massive downgrade in usability. Avoid upgrading if possible.

Does what it says on the tin.

Works as it should. Pay attention to the username and bio before you follow someone. It does work on your Lists.

Shows no button, and Alt-B brings up the Bookmarks menu, so this just does not work.

By running this Add-on repeatidly, I found accounts on Blue Sky for 60% of all of the users I follow on Twitter.