console.diff(...)

An extension for developers that enhances the console API by incorporating the ability to compare objects and adds a JSDiff tab (parallel to Elements, Network panels) within your dev-tools for viewing the results.

Note: before using, immediately after fresh installation, - make sure to refresh inspected tab or restart browser.

API:
// compare left and right
console.diff(left, right);

// shorthand for console.diffPush(next)
console.diff(next);

// update object on the left side only
console.diffLeft(left);

// update object on the right side only
console.diffRight(right);

// shifts sides, right becomes left, next becomes right
console.diffPush(next);

Read more at: https://github.com/zendive/jsdiff