Unfavourite all favourited tweets currently on your favourites page

drop-favourited-tweets.js

// Usage:
// 1. Go to https://twitter.com/favorites in a browser that supports ES6
// 2. Open local equivalent of the JS console
// 3. Run this code.

function unfavourite(tweet) {
    let $tweet = (sel) => jQuery(sel, tweet);
    $tweet('.js-actionFavorite:visible').click();
    console.log(
        "Unfavourited:\n",
        $tweet('.tweet-text').text(),
        "\nby ", $tweet('.username').text(), '[ ', $tweet('.js-permalink').text(), ' ]'
    );
}

let tweets = document.querySelectorAll('#stream-items-id > li');
let step   = 0;
for(let tweet of Array.from(tweets).reverse()) {
    setTimeout(unfavourite.bind(null, tweet), step++ * 500 );
}