AndOTP : Import works, but without labels. You will have to edit them manually.
WinAuth : Import works flawlessly.
For Adding Steam : You have to click the edit button, Then copy/paste your "secret" from Unencrypted WinAuth or AndOTP backup.
For Steam users : You need a rooted android phone and Winauth / SDA.
Check instructions here: https://steamcommunity.com/sharedfiles/filedetails/?id=581563653
https://github.com/Jessecar96/SteamDesktopAuthenticator
Using WinAuth to setup Steam is by far the easiest method. You still need a phone to recieve SMS. Once setup in WinAuth, you will be able to use your "Secret" key to add it to "Authenticator for FF/Chrome".

Thank you for this great add-on!

super helpful; also great for transferring codes from mobile device to another one since it can show the qr codes for each; on my iphone i can't do that, which is a pain.

Can't sync

The only issue i have with this is if the QR code is elsewhere (other than firefox) its not able to take a screenshot of it. Barring that, this is a nice little utility

I LOVE MY ECO-FRIENDLY SAFE 4 HUMANITY COMMUNITY

Great add-on, works perfectly on PC & Android. TBH first i afraid to install this, because i didn't know this developer...but all information seems to be ok, so i trust his/her words. Thank you for sharing this.