diff --git a/snippets/jsprettifier/README.md b/snippets/jsprettifier/README.md
new file mode 100644
index 0000000..f6e2f66
--- /dev/null
+++ b/snippets/jsprettifier/README.md
@@ -0,0 +1,7 @@
+### jsprettifier
+
+Prettify JavaScript files directly in browser.
+
+[jsprettifier-bookmarklet](https://github.com/marcobarcelos/jsprettifier-bookmarklet) created by [Marco Barcelos](http://marcobarcelos.com).
+
+[![screenshot](jsprettifier.png)](jsprettifier.js)
diff --git a/snippets/jsprettifier/jsprettifier.js b/snippets/jsprettifier/jsprettifier.js
new file mode 100644
index 0000000..471ed55
--- /dev/null
+++ b/snippets/jsprettifier/jsprettifier.js
@@ -0,0 +1,41 @@
+// jsprettifier.js
+// https://github.com/bgrins/devtools-snippets
+// Prettify JavaScript files directly in browser.
+
+/**
+ * jsprettifier-bookmarklet
+ * A bookmarklet for prettifying JS directly in your browser
+ * https://github.com/marcobarcelos/jsprettifier-bookmarklet
+ * Copyright (c) 2015 Marco Barcelos
+ * Licensed under the MIT license
+ */
+(function () {
+  'use strict';
+
+  function prettify() {
+    // JSBeautify (c) Einar Lielmanis and contributors, MIT License
+    (function(){function e(e,t){for(var n=0;n<t.length;n+=1)if(t[n]===e)return!0;return!1}function t(e){return e.replace(/^\s+|\s+$/g,"")}function n(e){return e.replace(/^\s+/g,"")}function _(e,t){"use strict";var n=new r(e,t);return n.beautify()}function r(_,r){"use strict";function i(e,t){var n=0;e&&(n=e.indentation_level,!z.just_added_newline()&&e.line_indent_level>n&&(n=e.line_indent_level));var _={mode:t,parent:e,last_text:e?e.last_text:"",last_word:e?e.last_word:"",declaration_statement:!1,declaration_assignment:!1,multiline_frame:!1,if_block:!1,else_block:!1,do_block:!1,do_while:!1,in_case_statement:!1,in_case:!1,case_body:!1,indentation_level:n,line_indent_level:e?e.line_indent_level:n,start_line_index:z.get_line_number(),ternary_depth:0};return _}function c(e){var t=e.newlines,n=te.keep_array_indentation&&K(q.mode);if(n)for(_=0;t>_;_+=1)u(_>0);else 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+
+    // Prism (c) Lea Verou, MIT License
+    (function(){var _self="undefined"!=typeof window?window:"undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?self:{},Prism=function(){var e=/\blang(?:uage)?-(?!\*)(\w+)\b/i,t=_self.Prism={util:{encode:function(e){return e instanceof n?new n(e.type,t.util.encode(e.content),e.alias):"Array"===t.util.type(e)?e.map(t.util.encode):e.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/\u00a0/g," ")},type:function(e){return Object.prototype.toString.call(e).match(/\[object (\w+)\]/)[1]},clone:function(e){var n=t.util.type(e);switch(n){case"Object":var a={};for(var r in e)e.hasOwnProperty(r)&&(a[r]=t.util.clone(e[r]));return a;case"Array":return e.map&&e.map(function(e){return t.util.clone(e)})}return e}},languages:{extend:function(e,n){var a=t.util.clone(t.languages[e]);for(var r in n)a[r]=n[r];return a},insertBefore:function(e,n,a,r){r=r||t.languages;var l=r[e];if(2==arguments.length){a=arguments[1];for(var i in a)a.hasOwnProperty(i)&&(l[i]=a[i]);return l}var o={};for(var s in l)if(l.hasOwnProperty(s)){if(s==n)for(var i in a)a.hasOwnProperty(i)&&(o[i]=a[i]);o[s]=l[s]}return t.languages.DFS(t.languages,function(t,n){n===r[e]&&t!=e&&(this[t]=o)}),r[e]=o},DFS:function(e,n,a){for(var r in e)e.hasOwnProperty(r)&&(n.call(e,r,e[r],a||r),"Object"===t.util.type(e[r])?t.languages.DFS(e[r],n):"Array"===t.util.type(e[r])&&t.languages.DFS(e[r],n,r))}},plugins:{},highlightAll:function(e,n){for(var a,r=document.querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'),l=0;a=r[l++];)t.highlightElement(a,e===!0,n)},highlightElement:function(n,a,r){for(var l,i,o=n;o&&!e.test(o.className);)o=o.parentNode;o&&(l=(o.className.match(e)||[,""])[1],i=t.languages[l]),n.className=n.className.replace(e,"").replace(/\s+/g," ")+" language-"+l,o=n.parentNode,/pre/i.test(o.nodeName)&&(o.className=o.className.replace(e,"").replace(/\s+/g," ")+" language-"+l);var s=n.textContent,u={element:n,language:l,grammar:i,code:s};if(!s||!i)return t.hooks.run("complete",u),void 0;if(t.hooks.run("before-highlight",u),a&&_self.Worker){var g=new Worker(t.filename);g.onmessage=function(e){u.highlightedCode=e.data,t.hooks.run("before-insert",u),u.element.innerHTML=u.highlightedCode,r&&r.call(u.element),t.hooks.run("after-highlight",u),t.hooks.run("complete",u)},g.postMessage(JSON.stringify({language:u.language,code:u.code,immediateClose:!0}))}else u.highlightedCode=t.highlight(u.code,u.grammar,u.language),t.hooks.run("before-insert",u),u.element.innerHTML=u.highlightedCode,r&&r.call(n),t.hooks.run("after-highlight",u),t.hooks.run("complete",u)},highlight:function(e,a,r){var l=t.tokenize(e,a);return n.stringify(t.util.encode(l),r)},tokenize:function(e,n){var a=t.Token,r=[e],l=n.rest;if(l){for(var i in l)n[i]=l[i];delete n.rest}e:for(var i in n)if(n.hasOwnProperty(i)&&n[i]){var o=n[i];o="Array"===t.util.type(o)?o:[o];for(var s=0;s<o.length;++s){var u=o[s],g=u.inside,c=!!u.lookbehind,f=0,h=u.alias;u=u.pattern||u;for(var p=0;p<r.length;p++){var d=r[p];if(r.length>e.length)break e;if(!(d instanceof a)){u.lastIndex=0;var m=u.exec(d);if(m){c&&(f=m[1].length);var y=m.index-1+f,m=m[0].slice(f),v=m.length,k=y+v,b=d.slice(0,y+1),w=d.slice(k+1),P=[p,1];b&&P.push(b);var A=new a(i,g?t.tokenize(m,g):m,h);P.push(A),w&&P.push(w),Array.prototype.splice.apply(r,P)}}}}}return r},hooks:{all:{},add:function(e,n){var a=t.hooks.all;a[e]=a[e]||[],a[e].push(n)},run:function(e,n){var a=t.hooks.all[e];if(a&&a.length)for(var r,l=0;r=a[l++];)r(n)}}},n=t.Token=function(e,t,n){this.type=e,this.content=t,this.alias=n};if(n.stringify=function(e,a,r){if("string"==typeof e)return e;if("Array"===t.util.type(e))return e.map(function(t){return n.stringify(t,a,e)}).join("");var l={type:e.type,content:n.stringify(e.content,a,r),tag:"span",classes:["token",e.type],attributes:{},language:a,parent:r};if("comment"==l.type&&(l.attributes.spellcheck="true"),e.alias){var i="Array"===t.util.type(e.alias)?e.alias:[e.alias];Array.prototype.push.apply(l.classes,i)}t.hooks.run("wrap",l);var o="";for(var s in l.attributes)o+=(o?" ":"")+s+'="'+(l.attributes[s]||"")+'"';return"<"+l.tag+' class="'+l.classes.join(" ")+'" '+o+">"+l.content+"</"+l.tag+">"},!_self.document)return _self.addEventListener?(_self.addEventListener("message",function(e){var n=JSON.parse(e.data),a=n.language,r=n.code,l=n.immediateClose;_self.postMessage(t.highlight(r,t.languages[a],a)),l&&_self.close()},!1),_self.Prism):_self.Prism;var a=document.getElementsByTagName("script");return a=a[a.length-1],a&&(t.filename=a.src,document.addEventListener&&!a.hasAttribute("data-manual")&&document.addEventListener("DOMContentLoaded",t.highlightAll)),_self.Prism}();"undefined"!=typeof module&&module.exports&&(module.exports=Prism),"undefined"!=typeof global&&(global.Prism=Prism);})();
+    Prism.languages.clike={comment:[{pattern:/(^|[^\\])\/\*[\w\W]*?\*\//,lookbehind:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0}],string:/(["'])(\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,"class-name":{pattern:/((?:\b(?:class|interface|extends|implements|trait|instanceof|new)\s+)|(?:catch\s+\())[a-z0-9_\.\\]+/i,lookbehind:!0,inside:{punctuation:/(\.|\\)/}},keyword:/\b(if|else|while|do|for|return|in|instanceof|function|new|try|throw|catch|finally|null|break|continue)\b/,"boolean":/\b(true|false)\b/,"function":/[a-z0-9_]+(?=\()/i,number:/\b-?(?:0x[\da-f]+|\d*\.?\d+(?:e[+-]?\d+)?)\b/i,operator:/--?|\+\+?|!=?=?|<=?|>=?|==?=?|&&?|\|\|?|\?|\*|\/|~|\^|%/,punctuation:/[{}[\];(),.:]/};
+    Prism.languages.javascript=Prism.languages.extend("clike",{keyword:/\b(as|async|await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|false|finally|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|true|try|typeof|var|void|while|with|yield)\b/,number:/\b-?(0x[\dA-Fa-f]+|0b[01]+|0o[0-7]+|\d*\.?\d+([Ee][+-]?\d+)?|NaN|Infinity)\b/,"function":/[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*(?=\()/i}),Prism.languages.insertBefore("javascript","keyword",{regex:{pattern:/(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\\\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,lookbehind:!0}}),Prism.languages.insertBefore("javascript","class-name",{"template-string":{pattern:/`(?:\\`|\\?[^`])*`/,inside:{interpolation:{pattern:/\$\{[^}]+\}/,inside:{"interpolation-punctuation":{pattern:/^\$\{|\}$/,alias:"punctuation"},rest:Prism.languages.javascript}},string:/[\s\S]+/}}}),Prism.languages.markup&&Prism.languages.insertBefore("markup","tag",{script:{pattern:/<script[\w\W]*?>[\w\W]*?<\/script>/i,inside:{tag:{pattern:/<script[\w\W]*?>|<\/script>/i,inside:Prism.languages.markup.tag.inside},rest:Prism.languages.javascript},alias:"language-javascript"}}),Prism.languages.js=Prism.languages.javascript;
+
+    // Set style
+    var style = document.createElement('style');
+    style.textContent = 'body,html{padding:0;margin:0;}code[class*=language-],pre[class*=language-]{color:#333;font-size: 13.5px;font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;direction:ltr;text-align:left;white-space:pre;word-spacing:normal;word-break:normal;word-wrap:normal;-moz-tab-size:4;-o-tab-size:4;line-height:1.45;tab-size:4;-webkit-hyphens:none;-moz-hyphens:none;-ms-hyphens:none;hyphens:none}code[class*=language-] ::-moz-selection,code[class*=language-]::-moz-selection,pre[class*=language-] ::-moz-selection,pre[class*=language-]::-moz-selection{text-shadow:none;background:#b3d4fc}code[class*=language-] ::selection,code[class*=language-]::selection,pre[class*=language-] ::selection,pre[class*=language-]::selection{text-shadow:none;background:#b3d4fc}@media print{code[class*=language-],pre[class*=language-]{text-shadow:none}}pre[class*=language-]{padding:.5em .75em;margin:0;overflow:auto}:not(pre)>code[class*=language-],pre[class*=language-]{}:not(pre)>code[class*=language-]{padding:.1em;border-radius:.3em}.token.cdata,.token.comment,.token.doctype,.token.prolog{color:#708090}.token.punctuation{color:#333}.namespace{opacity:.7}.token.boolean,.token.constant,.token.deleted,.token.number,.token.property,.token.symbol,.token.tag{color:#3554FF}.token.attr-name,.token.builtin,.token.char,.token.inserted,.token.selector,.token.string{color:#395CC7}.language-css .token.string,.style .token.string,.token.entity,.token.operator,.token.url{color:#BD0054;background:hsla(0,0%,100%,.5)}.token.atrule,.token.attr-value,.token.keyword{color:#D63680}.token.function{color:#8054C3}.token.important,.token.regex,.token.variable{color:#0B9BCC}.token.bold,.token.important{font-weight:700}.token.italic{font-style:italic}.token.entity{cursor:help}';
+    document.head.innerHTML = '';
+    document.head.appendChild(style);
+
+    // Fill body
+    var textContent = document.body.textContent;
+    var beautified = js_beautify(textContent, { end_with_newline: true, indent_size: 2 });
+    var highlighted = Prism.highlight(beautified, Prism.languages.javascript);
+    document.body.innerHTML = '<code><pre class="language-js">' + highlighted + '</pre></code>';
+  }
+
+  // Loading state
+  document.body.innerHTML = '<div style="color: #bbb; -webkit-filter: blur(1px); filter: blur(1px);">' + document.body.innerHTML + '</div>';
+  setTimeout(prettify, 50);
+
+})();
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