- Adds beta support for Firefox and Chromium‑based Edge, plus new Cypress.isBrowser utility and channel info for browsers.
- Introduces breaking changes: upgraded Mocha/Chai/Sinon, altered before:browser:launch args signature, cy.writeFile now returns null, requires Node.js 8+, and drops CJSX support.
- Fixes various bugs (e.g., .only duplicate title handling, .its index support, UI inconsistencies) and adds documentation such as a Cross‑Browser Testing guide.
4.0.0
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