diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
index 70546b7aab..3b0fcdfd0b 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/about.tt
@@ -1049,7 +1049,7 @@
 
                         <h2>Font Face Observer</h2>
                         <p>
-                            <a href="https://github.com/bramstein/fontfaceobserver">Font Face Observer JavaScript library v2.0.3</a>: <a href="https://github.com/bramstein/fontfaceobserver/blob/v2.0.3/LICENSE">BSD License</a>
+                            <a href="https://github.com/bramstein/fontfaceobserver">Font Face Observer JavaScript library v2.3.0</a>: <a href="https://github.com/bramstein/fontfaceobserver/blob/v2.3.0/LICENSE">BSD 2-Clause "Simplified" License</a>
                         </p>
 
                         <h2>GreyBox</h2>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-bottom.inc b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-bottom.inc
index 943c862eab..1a3809e3f2 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-bottom.inc
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-bottom.inc
@@ -137,7 +137,7 @@
 [% Asset.js("lib/jquery/jquery-3.6.0.min.js") | $raw %]
 [% Asset.js("lib/jquery/jquery-migrate-3.3.2.min.js") | $raw %]
 [% Asset.js("lib/bootstrap/js/bootstrap.bundle.min.js") | $raw %]
-[% Asset.js("lib/fontfaceobserver.min.js") | $raw %]
+[% Asset.js("lib/fontfaceobserver/fontfaceobserver.min.js") | $raw %]
 [% Asset.js("lib/enquire.min.js") | $raw %]
 <script>
     let logged_in_user_id = "[% logged_in_user.borrowernumber | html %]";
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/printslip.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/printslip.tt
index be7add462e..1d2e44d7c0 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/printslip.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/printslip.tt
@@ -17,7 +17,7 @@
 <!-- JavaScript includes -->
 [% Asset.js("lib/jquery/jquery-3.6.0.min.js") | $raw %]
 [% Asset.js("lib/jquery/jquery-migrate-3.3.2.min.js") | $raw %]
-[% Asset.js("lib/fontfaceobserver.min.js") | $raw %]
+[% Asset.js("lib/fontfaceobserver/fontfaceobserver.min.js") | $raw %]
 [% Asset.js("lib/enquire.min.js") | $raw %]
 [% Asset.js("js/global.js") | $raw %]
 
diff --git a/koha-tmpl/opac-tmpl/lib/fontfaceobserver.min.js b/koha-tmpl/opac-tmpl/lib/fontfaceobserver.min.js
deleted file mode 100644
index 8767ed0f5e..0000000000
--- a/koha-tmpl/opac-tmpl/lib/fontfaceobserver.min.js
+++ /dev/null
@@ -1,12 +0,0 @@
-/* Font Face Observer v2.0.13 - © Bram Stein. License: BSD-3-Clause */(function(){'use strict';var f,g=[];function l(a){g.push(a);1==g.length&&f()}function m(){for(;g.length;)g[0](),g.shift()}f=function(){setTimeout(m)};function n(a){this.a=p;this.b=void 0;this.f=[];var b=this;try{a(function(a){q(b,a)},function(a){r(b,a)})}catch(c){r(b,c)}}var p=2;function t(a){return new n(function(b,c){c(a)})}function u(a){return new n(function(b){b(a)})}function q(a,b){if(a.a==p){if(b==a)throw new TypeError;var c=!1;try{var d=b&&b.then;if(null!=b&&"object"==typeof b&&"function"==typeof d){d.call(b,function(b){c||q(a,b);c=!0},function(b){c||r(a,b);c=!0});return}}catch(e){c||r(a,e);return}a.a=0;a.b=b;v(a)}}
-function r(a,b){if(a.a==p){if(b==a)throw new TypeError;a.a=1;a.b=b;v(a)}}function v(a){l(function(){if(a.a!=p)for(;a.f.length;){var b=a.f.shift(),c=b[0],d=b[1],e=b[2],b=b[3];try{0==a.a?"function"==typeof c?e(c.call(void 0,a.b)):e(a.b):1==a.a&&("function"==typeof d?e(d.call(void 0,a.b)):b(a.b))}catch(h){b(h)}}})}n.prototype.g=function(a){return this.c(void 0,a)};n.prototype.c=function(a,b){var c=this;return new n(function(d,e){c.f.push([a,b,d,e]);v(c)})};
-function w(a){return new n(function(b,c){function d(c){return function(d){h[c]=d;e+=1;e==a.length&&b(h)}}var e=0,h=[];0==a.length&&b(h);for(var k=0;k<a.length;k+=1)u(a[k]).c(d(k),c)})}function x(a){return new n(function(b,c){for(var d=0;d<a.length;d+=1)u(a[d]).c(b,c)})};window.Promise||(window.Promise=n,window.Promise.resolve=u,window.Promise.reject=t,window.Promise.race=x,window.Promise.all=w,window.Promise.prototype.then=n.prototype.c,window.Promise.prototype["catch"]=n.prototype.g);}());
-
-(function(){function l(a,b){document.addEventListener?a.addEventListener("scroll",b,!1):a.attachEvent("scroll",b)}function m(a){document.body?a():document.addEventListener?document.addEventListener("DOMContentLoaded",function c(){document.removeEventListener("DOMContentLoaded",c);a()}):document.attachEvent("onreadystatechange",function k(){if("interactive"==document.readyState||"complete"==document.readyState)document.detachEvent("onreadystatechange",k),a()})};function r(a){this.a=document.createElement("div");this.a.setAttribute("aria-hidden","true");this.a.appendChild(document.createTextNode(a));this.b=document.createElement("span");this.c=document.createElement("span");this.h=document.createElement("span");this.f=document.createElement("span");this.g=-1;this.b.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.c.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
-this.f.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.h.style.cssText="display:inline-block;width:200%;height:200%;font-size:16px;max-width:none;";this.b.appendChild(this.h);this.c.appendChild(this.f);this.a.appendChild(this.b);this.a.appendChild(this.c)}
-function t(a,b){a.a.style.cssText="max-width:none;min-width:20px;min-height:20px;display:inline-block;overflow:hidden;position:absolute;width:auto;margin:0;padding:0;top:-999px;white-space:nowrap;font-synthesis:none;font:"+b+";"}function y(a){var b=a.a.offsetWidth,c=b+100;a.f.style.width=c+"px";a.c.scrollLeft=c;a.b.scrollLeft=a.b.scrollWidth+100;return a.g!==b?(a.g=b,!0):!1}function z(a,b){function c(){var a=k;y(a)&&a.a.parentNode&&b(a.g)}var k=a;l(a.b,c);l(a.c,c);y(a)};function A(a,b){var c=b||{};this.family=a;this.style=c.style||"normal";this.weight=c.weight||"normal";this.stretch=c.stretch||"normal"}var B=null,C=null,E=null,F=null;function G(){if(null===C)if(J()&&/Apple/.test(window.navigator.vendor)){var a=/AppleWebKit\/([0-9]+)(?:\.([0-9]+))(?:\.([0-9]+))/.exec(window.navigator.userAgent);C=!!a&&603>parseInt(a[1],10)}else C=!1;return C}function J(){null===F&&(F=!!document.fonts);return F}
-function K(){if(null===E){var a=document.createElement("div");try{a.style.font="condensed 100px sans-serif"}catch(b){}E=""!==a.style.font}return E}function L(a,b){return[a.style,a.weight,K()?a.stretch:"","100px",b].join(" ")}
-A.prototype.load=function(a,b){var c=this,k=a||"BESbswy",q=0,D=b||3E3,H=(new Date).getTime();return new Promise(function(a,b){if(J()&&!G()){var M=new Promise(function(a,b){function e(){(new Date).getTime()-H>=D?b():document.fonts.load(L(c,'"'+c.family+'"'),k).then(function(c){1<=c.length?a():setTimeout(e,25)},function(){b()})}e()}),N=new Promise(function(a,c){q=setTimeout(c,D)});Promise.race([N,M]).then(function(){clearTimeout(q);a(c)},function(){b(c)})}else m(function(){function u(){var b;if(b=-1!=
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-g=n.a.offsetWidth,h=p.a.offsetWidth,u();q=setTimeout(I,50)}}var e=new r(k),n=new r(k),p=new r(k),f=-1,g=-1,h=-1,v=-1,w=-1,x=-1,d=document.createElement("div");d.dir="ltr";t(e,L(c,"sans-serif"));t(n,L(c,"serif"));t(p,L(c,"monospace"));d.appendChild(e.a);d.appendChild(n.a);d.appendChild(p.a);document.body.appendChild(d);v=e.a.offsetWidth;w=n.a.offsetWidth;x=p.a.offsetWidth;I();z(e,function(a){f=a;u()});t(e,L(c,'"'+c.family+'",sans-serif'));z(n,function(a){g=a;u()});t(n,L(c,'"'+c.family+'",serif'));
-z(p,function(a){h=a;u()});t(p,L(c,'"'+c.family+'",monospace'))})})};"object"===typeof module?module.exports=A:(window.FontFaceObserver=A,window.FontFaceObserver.prototype.load=A.prototype.load);}());
diff --git a/koha-tmpl/opac-tmpl/lib/fontfaceobserver/fontfaceobserver.min.js b/koha-tmpl/opac-tmpl/lib/fontfaceobserver/fontfaceobserver.min.js
new file mode 100644
index 0000000000..3177ec6d94
--- /dev/null
+++ b/koha-tmpl/opac-tmpl/lib/fontfaceobserver/fontfaceobserver.min.js
@@ -0,0 +1,8 @@
+/* Font Face Observer v2.3.0 - © Bram Stein. License: BSD-3-Clause */(function(){function p(a,c){document.addEventListener?a.addEventListener("scroll",c,!1):a.attachEvent("scroll",c)}function u(a){document.body?a():document.addEventListener?document.addEventListener("DOMContentLoaded",function b(){document.removeEventListener("DOMContentLoaded",b);a()}):document.attachEvent("onreadystatechange",function g(){if("interactive"==document.readyState||"complete"==document.readyState)document.detachEvent("onreadystatechange",g),a()})};function w(a){this.g=document.createElement("div");this.g.setAttribute("aria-hidden","true");this.g.appendChild(document.createTextNode(a));this.h=document.createElement("span");this.i=document.createElement("span");this.m=document.createElement("span");this.j=document.createElement("span");this.l=-1;this.h.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.i.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
+this.j.style.cssText="max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";this.m.style.cssText="display:inline-block;width:200%;height:200%;font-size:16px;max-width:none;";this.h.appendChild(this.m);this.i.appendChild(this.j);this.g.appendChild(this.h);this.g.appendChild(this.i)}
+function x(a,c){a.g.style.cssText="max-width:none;min-width:20px;min-height:20px;display:inline-block;overflow:hidden;position:absolute;width:auto;margin:0;padding:0;top:-999px;white-space:nowrap;font-synthesis:none;font:"+c+";"}function B(a){var c=a.g.offsetWidth,b=c+100;a.j.style.width=b+"px";a.i.scrollLeft=b;a.h.scrollLeft=a.h.scrollWidth+100;return a.l!==c?(a.l=c,!0):!1}function C(a,c){function b(){var e=g;B(e)&&null!==e.g.parentNode&&c(e.l)}var g=a;p(a.h,b);p(a.i,b);B(a)};function D(a,c,b){c=c||{};b=b||window;this.family=a;this.style=c.style||"normal";this.weight=c.weight||"normal";this.stretch=c.stretch||"normal";this.context=b}var E=null,F=null,G=null,H=null;function I(a){null===F&&(M(a)&&/Apple/.test(window.navigator.vendor)?(a=/AppleWebKit\/([0-9]+)(?:\.([0-9]+))(?:\.([0-9]+))/.exec(window.navigator.userAgent),F=!!a&&603>parseInt(a[1],10)):F=!1);return F}function M(a){null===H&&(H=!!a.document.fonts);return H}
+function N(a,c){var b=a.style,g=a.weight;if(null===G){var e=document.createElement("div");try{e.style.font="condensed 100px sans-serif"}catch(q){}G=""!==e.style.font}return[b,g,G?a.stretch:"","100px",c].join(" ")}
+D.prototype.load=function(a,c){var b=this,g=a||"BESbswy",e=0,q=c||3E3,J=(new Date).getTime();return new Promise(function(K,L){if(M(b.context)&&!I(b.context)){var O=new Promise(function(r,t){function h(){(new Date).getTime()-J>=q?t(Error(""+q+"ms timeout exceeded")):b.context.document.fonts.load(N(b,'"'+b.family+'"'),g).then(function(n){1<=n.length?r():setTimeout(h,25)},t)}h()}),P=new Promise(function(r,t){e=setTimeout(function(){t(Error(""+q+"ms timeout exceeded"))},q)});Promise.race([P,O]).then(function(){clearTimeout(e);
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