Previously, I have never experienced losing the 2FA code but now I don't save Rollbit's secret 2FA code while the 2FA code is still active at the extension.
I really can not understand your post. How 2FA code can be active at an extension?
You must install that activation code to use and you can backup it somewhere, but on your extension, how? In addition, it is only an activation code and installation is necessary to have 2FA code for log in your account or withdrawal request for example.
If you don't backup your 2FA (activation) code properly, you will have risk of losing it and also troubles with your account in future.
This might be related to chrome extension where opening rollbit site is done with pc or laptop and using 2FA extension in the same chrome.
Because for 2FA now we can not only save on the phone through the application but can also be done with extensions in chrome so that it can still be active.
Indeed, the risk here is much greater than in the application on our cellphone but indeed this can still be done, it's just that it might need some consideration because as you said security might be a little doubtful even though the extension we have is on our PC or laptop because indeed apart from the risk of loss this can also trigger other things such as hacking for our PC or laptop as the worst possibility.