Right now (129.0.2 back to when Add-on import was introduced) when you import data from another browser, you're presented with a checkbox to either import Add-ons or not. If you choose to import them, the only "option" you're given is to finish importing without even knowing what is being added. I feel like it would be a good idea to at least present a list of Add-ons to be imported, and better, offer a Cancel option, and best, offer Checkboxes for each one, pre-checked, with Select All and Deselect All options.
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