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. Motivation: Track object mutations during runtime and/or while debugging with intention to find expected or unexpected changes. Note: this extension utilises content scripts, so after immediate installation or an update, make sure to refresh the inspected tab before using its functionality. API: // compare left and right arguments console.diff( { a: 1, b: 1, c: 3 }, { a: 1, b: 2, d: 3 } ); // with a single argument behaves the same as `console.diffPush` console.diff(Date.now()); // shifts sides - previous right side becomes left, new value becomes right console.diffPush(Date.now()); // update left side only console.diffLeft(Date.now()); // update right side only console.diffRight(Date.now()); Read more at: https://github.com/zendive/jsdiff