Change gecko id in "browser_specific_settings"

Hi, I have a question about “browser_specific_settings” . When I submit add-on on Firefox I can change a new gecko id in “browser_specific_settings” ? If can change that how I do it. Thank you

That ID is used to identify your extension. So if you’ve already published it, you likely don’t want to change the ID. Else you simply change the contents of the JSON file.

And in the case that I want to change. Can I change it?

You can’t change the ID of an existing add-on. A new ID is a new add-on, and you won’t be able to automatically migrate your users to the new ID if you choose to start over.