console.diff(...)

API:

console.diff(left, right); // compare left and right
console.diff(next); // shorthand of diffPush while single argumented
console.diffLeft(left); // update object on the left side only
console.diffRight(right); // update object on the right side only
console.diffPush(next); // shifts sides, right becomes left, next becomes right

Usage basics:

Historicly, left side represents the old state and right side the new state.
Things that are present on the left side but missing on the right side are colour-coded as red (old).
Things that are missing on the left side but present on the right side are colour-coded as green (new).
To track changes of the same variable in timed manner you can push it with `diffPush` command,
that will shift objects from right to left, showing differences with previous push state.
You can compare objects from different tabs (sites).

Gotcha:

Comparred objects shouldn't contain functions or self-recurrent references, like DOM elements or view instances have.