Misc. bookmarklets from https://news.ycombinator.com/item?id=38014069

canvas-dl.js

//bookmarklet-title: Canvas DL
//bookmarklet-about: When playing skribbl.io and someone has made a nice drawing, this lets you download the current drawing as a PNG.

var w = window.wdq || (window.wdq = document.createElement("a"));
var p = /The word was '([^']*)'/g,
    pp = /<span>([^<>]+) is drawing now!/g,
    tt = document.body.innerHTML;
var mm, nn, xx;
while (mm = p.exec(tt)) nn = mm;
while (mm = pp.exec(tt)) xx = mm;
w.download = location.host + "_" + (nn ? nn[1] + "_" : "") + (xx ? xx[1] + "_" : "") + new Date().toISOString().replace(/:/g, "_");
w.href = document.querySelector("canvas").toDataURL();
w.click();

md-link.js

//bookmarklet-title: Markdown Link
//bookmarklet-about: Get Markdown link of the current page as [Title](url).

function e() {
    var e = "";
    if (window.getSelection) e = window.getSelection().toString();
    else if (document.getSelection) e = document.getSelection().toString();
    else {
        if (!document.selection) return null;
        e = document.selection.createRange().text
    }
    return e
}
var t = e(),
    n = window.document.title,
    o = window.location.href,
    i = [];
if (t) {
    i.push("[" + t + "]")
} else {
    i.push("[" + n + "]"), i.push("(" + o + ")")
}
window.prompt("created link", i.join(""))

nitter.js

//bookmarklet-title: Nitter
//bookmarklet-about: Twitter to Nitter.

h = ['nitter.it', 'nitter.snopyta.org', 'nitter.net'];
location.href = location.href.replace(window.location.host, h[Math.floor(Math.random() * h.length)]);

no-alt.js

//bookmarklet-title: Nebula No-Alt-#
//bookmarklet-about: Nebula's video viewer annoying captures e.g. alt-3 to do the same as plain 3 (seek to 3/10 of the video currently playing), but I expect it to switch to the 3rd browser tab instead. YouTube doesn't do this. Luckily I can just activate this bookmarklet.

document.addEventListener("keydown", (e) => void(e.altKey && !isNaN(+e.key) && e.stopPropagation()))

no-paste.js

//bookmarklet-title: Don't Mess With Paste
//bookmarklet-about: For when signup forms expect you to hand-type your email address twice.

["contextmenu", "copy", "paste", "selectstart"].map(e => document.addEventListener(e, e => e.stopPropagation(), true))

slack.js

//bookmarklet-title: Unfuck Slack
//bookmarklet-about: Restore Slack's old UI.

localStorage.setItem("localConfig_v2", localStorage.getItem("localConfig_v2").replace(/\"is_unified_user_client_enabled\":true/g, '\"is_unified_user_client_enabled\":false'));
location.reload();

wayback.js

//bookmarklet-title: Wayback
//bookmarklet-about: See current page on the Wayback Machine.

window.open('https://web.archive.org/web/*/' + location.href.replace(/\/$/, ''))