Text controls - icon overlaps with text when prefix - icon is used (Firefox only)

[mvneerven]

When a Shop is created as part of the Onboarding flow the user has the option of providing a mail address to which the URL of the new shop instance will be sent.
In that page the mail envelope icon overlaps with the "Your email address" text if the used browser is Firefox.
NOTE: in Chrome and Edge there is no overlap

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