It's working so far. And about the noob who said "I think it's scam, it changed my API key".

1 - There is no point for a scammer to change the API Key

2 - There is an option in the extension to do not change the api key "Auto-set Steam API key"

3 - Work as expected on latest Firefox.

4 - Only bad things, it requests too much permissions.

Thanks for your addon! Please, fix outbid function in main page https://steamcommunity.com/market/. It always reverts back my buyorder item quantity to 1 , then I click "outbid" !!
Can you also add button for cancel all buy orders? Thanks!