We cannot order the individual profiles by MRU (most-recently-used) order, but we can organize the browser list like this. We should do that to make it easier for users to select the browser that they're more likely to want to migrate from (and to select by default the one that was most recently used).

The easiest way to do this is to update this method here to include the result of calling await migrator.getLastUsedDate() and assigning that to some property here.

Then, add another step here to sort the Array of objects by that property that you added. Something like:

return results.flat().filter(result => result).sort((a, b) => {
  return a.lastModifiedDate - b.lastModifiedDate;
});

https://hg.mozilla.org/mozilla-central/rev/86941b3c7c5e