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diff --git a/static/favicons.js b/static/favicons.js
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+// from sizeof.cat 
+
+function favicons () {
+  this.hidden = "hidden";
+  this.visibilityChange = "visibilitychange";
+  this.favicon = document.querySelector("[rel='shortcut icon']").href;
+  this.title = document.title;
+
+  /* Define a list of "services", each being a pair of favicon URL and the tab title to show. */
+  this.services = {
+    /* Reddit */
+    reddit: () => {
+      let title = "Reddit - Dive into anything";
+      let favicon = "/img/favicons/reddit.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* X, formerly known as Twitter */
+    x: () => {
+      let title = "X. It's what's happening / X";
+      let favicon = "/img/favicons/x.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* Bluesky */
+    bluesky: () => {
+      let title = "Discover - Bluesky";
+      let favicon = "/img/favicons/bluesky.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* Wikipedia */
+    wikipedia: () => {
+      let title = "Wikipedia";
+      let favicon = "/img/favicons/wikipedia.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* TikTok, where the hip kids are hanging out */
+    tiktok: () => {
+      let title = "Explore - Find your favourite videos on TikTok";
+      let favicon = "/img/favicons/tiktok.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* Facebook, your grandma is most likely here */
+    facebook: () => {
+      /* Pick a random notification number between 1 and 100 */
+      let count = Math.round(Math.random() * 99) + 1;
+      let title = "(" + count + ") Facebook";
+      let favicon = "/img/favicons/facebook.ico";
+      return {
+        title, favicon
+      }
+    },
+    /* Instagram */
+    instagram: () => {
+      /* Pick a random notification number between 1 and 100 */
+      let count = Math.round(Math.random() * 99) + 1;
+      let title = "(" + count + ") Instagram";
+      let favicon = "/img/favicons/instagram.ico";
+      return {
+        title, favicon
+      }
+    }
+  }
+
+  /* Those "services" are enabled, which means the web browser tab can change
+    favicon/title using their data. */
+  this.enabledServices = [
+    'x',
+    'reddit',
+    'bluesky',
+    'instagram',
+    'tiktok',
+    'facebook',
+    'wikipedia'
+  ];
+
+  /* Initialization function, checks if the web browser has the specified event
+    listeners and binds a handler to the existing one. */
+  this.init = function () {
+    if (typeof document.mozHidden !== 'undefined') {
+      this.hidden = "mozHidden";
+      this.visibilityChange = "mozvisibilitychange";
+    } else if (typeof document.msHidden !== 'undefined') {
+      this.hidden = "msHidden";
+      this.visibilityChange = "msvisibilitychange";
+    } else if (typeof document.webkitHidden !== 'undefined') {
+      this.hidden = "webkitHidden";
+      this.visibilityChange = "webkitvisibilitychange";
+    }
+    document.addEventListener(this.visibilityChange, this.handler.bind(this), false);
+  }
+
+  /* The default function which returns the initial favicon/title pair of the
+    page, so it can get swapped back upon tab activation. */
+  this.default = function () {
+    let title = this.title;
+    let favicon = this.favicon;
+    this.update({
+      title, favicon
+    });
+  }
+
+  /* This function updates the favicon/title pair of the web browser tab when
+    the tab is not focused (hidden from view). We're using a cache-busting
+    technique so that the favicon is freshly loaded and not cached. */
+  this.update = function (data) {
+    let cacheBuster = "?v=" + Math.round(Math.random() * 10000000);
+    let link  = document.createElement('link');
+    link.type = "image/x-icon";
+    link.rel = "shortcut icon";
+    link.href = data.favicon + cacheBuster;
+    document.getElementsByTagName("head")[0].querySelector("[rel='shortcut icon']").remove();
+    document.getElementsByTagName("head")[0].appendChild(link);
+    document.title = data.title;
+  }
+
+  /* The spoof() function randomizes the enabled "services" and picks one from
+    them, updating the tab favicon and title. */
+  this.spoof = function () {
+    let i = Math.round(Math.random() * (this.enabledServices.length - 1));
+    let service = this.enabledServices[i];
+    if (service && this.services[service]) {
+      this.update(this.services[service]());
+    }
+  }
+
+  /* The default event handler which checks whether the current tab is hidden,
+    and if it is then it swaps the favicon/title pair with one from the
+    enabled "services". Otherwise, it shows the default favicon and title. */
+  this.handler = function () {
+    if (document[this.hidden]) {
+      this.spoof();
+    } else {
+      this.default();
+    }
+  }
+
+  /* Autorun the initialization function. */
+  this.init();
+}
+
+document.addEventListener("DOMContentLoaded", function(event) {
+  favicons();
+});