Bug 1883909 replaced `this.unregisterFormSubmissionListeners()` with `this.unregisterProgressListener()`. But we want to unregister all form submission listeners after a form submission, so we need to call `this.unregisterFormSubmissionListeners()`.
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Bug 1883909 replaced `this.unregisterFormSubmissionListeners()` with `this.unregisterProgressListener()` [here](https://searchfox.org/mozilla-central/source/toolkit/components/formautofill/FormAutofillChild.sys.mjs#584). But we want to unregister all form submission listeners after a form submission, so we need to call `this.unregisterFormSubmissionListeners()`.