I'm submitting a...
Type of bug / changes
https://docs.cypress.io/guides/core-concepts/writing-and-organizing-tests.html#Plugin-files
The part about plugins file being importing into specs doesn't sound right (it being in the background process, and all).
By default Cypress will automatically include the plugins file cypress/plugins/index.js before every single spec file it runs. We do this purely as a convenience mechanism so you don’t have to import this file in every single one of your spec files.