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Your account is compromised, you probably were phished at some point or otherwise tricked into handing over your credentials. 3rd party trading sites are a popular vector for this.
Secure your account and be more careful in the future.
You might want to get a handle on how the system actually works to better protect yourself.
You really shouldn't install random extensions like that because they can put your account and computer security at risk. The extension is likely how your item was stolen.
remember that - ALL OF THEM ARE USE AT OWN RISK
just because you think the site is "legit" does not mean it is legit.
Scan for malware. https://www.malwarebytes.com/
Check that the email and phone number on the steam account are still yours.
Deauthorize all devices https://store.steampowered.com/twofactor/manage
Change your password on a secure device.
Generate new back up codes. https://store.steampowered.com/twofactor/manage
Revoke the api key https://steamcommunity.com/dev/apikey