diff --git a/core/files.js b/core/files.js
index fd98b74c..53d03592 100644
--- a/core/files.js
+++ b/core/files.js
@@ -317,6 +317,9 @@ var files = {
         // SWFObject
         'resources/swfobject/2.2/swfobject.jsm': true,
 
+        // Tether JS
+        'resources/tether/1.4.7/js/tether.min.jsm': true,
+
         // toastr.js
         'resources/toastr.js/2.1.4/toastr.min.css': true,
         'resources/toastr.js/2.1.4/toastr.min.jsm': true,
diff --git a/core/mappings.js b/core/mappings.js
index bfd6e987..129bc408 100644
--- a/core/mappings.js
+++ b/core/mappings.js
@@ -157,6 +157,7 @@ var mappings = {
             'spin.js/{version}/spin.min.js': resources.spinJS,
             'socket.io/{version}/socket.io.': resources.socketIO,
             'swfobject/{version}/swfobject.': resources.swfobject,
+            'tether/{version}/js/tether.': resources.tetherJS,
             'toastr.js/{version}/toastr.min.css': resources.toastrCSS,
             'toastr.js/{version}/toastr.min.js': resources.toastrJS,
             'twitter-bootstrap/{version}/js/bootstrap.min.js': resources.twitterBootstrapJS,
diff --git a/core/resources.js b/core/resources.js
index babd17fb..b4ed39d3 100644
--- a/core/resources.js
+++ b/core/resources.js
@@ -430,6 +430,11 @@ var resources = {
         'path': 'resources/swfobject/{version}/swfobject.jsm',
         'type': 'application/javascript'
     },
+    // Tether JS
+    'tetherJS': {
+        'path': 'resources/tether/{version}/js/tether.min.jsm',
+        'type': 'application/javascript'
+    },
     // Twitter Bootstrap JS
     'twitterBootstrapJS': {
         'path': 'resources/twitter-bootstrap/{version}/js/bootstrap.min.jsm',
diff --git a/modules/internal/helpers.js b/modules/internal/helpers.js
index 31d45d46..a0470448 100644
--- a/modules/internal/helpers.js
+++ b/modules/internal/helpers.js
@@ -374,6 +374,8 @@ helpers.determineResourceName = function (filename) {
         return 'Store.js';
     case 'swfobject.jsm':
         return 'SWFObject';
+    case 'tether.min.jsm':
+        return 'Tether JS';
     case 'toastr.min.css':
         return 'toastr.js';
     case 'toastr.min.jsm':
@@ -607,6 +609,8 @@ helpers.setLastVersion = function (type, version) {
         version = '2.0.4';
     } else if (type.includes('/swfobject/2.')) {
         version = '2.2';
+    } else if (type.includes('/tether/1.')) {
+        version = '1.4.7';
     } else if (type.includes('/twitter-bootstrap/4.')) {
         version = '4.5.0';
     } else if (type.includes('/twitter-bootstrap/3.')) {
diff --git a/pages/updates/updates.html b/pages/updates/updates.html
index 2320dd8e..b16db176 100644
--- a/pages/updates/updates.html
+++ b/pages/updates/updates.html
@@ -25,6 +25,7 @@
                             <li>Fixed: Encoding problem with some websites (maybe only temporary, because at the moment only 9 websites are affected)</li>
                             <li>Added: Twitter Bootstrap JS and CSS v4.5.0</li>
                             <li>Added: Material Design for Bootstrap (MDB) v4.18.0</li>
+                            <li>Added: Tether v1.4.7</li>
                         </ul>
                     </div>
                         <ul>
diff --git a/resources/tether/1.4.7/js/tether.min.jsm b/resources/tether/1.4.7/js/tether.min.jsm
new file mode 100644
index 00000000..bae23a4d
--- /dev/null
+++ b/resources/tether/1.4.7/js/tether.min.jsm
@@ -0,0 +1 @@
+!function(t,e){"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?module.exports=e():t.Tether=e()}(this,function(){"use strict";function t(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function e(t){var o=t.getBoundingClientRect(),i={};for(var n in o)i[n]=o[n];try{if(t.ownerDocument!==document){var r=t.ownerDocument.defaultView.frameElement;if(r){var s=e(r);i.top+=s.top,i.bottom+=s.top,i.left+=s.left,i.right+=s.left}}}catch(a){}return i}function o(t){var e=getComputedStyle(t)||{},o=e.position,i=[];if("fixed"===o)return[t];for(var n=t;(n=n.parentNode)&&n&&1===n.nodeType;){var r=void 0;try{r=getComputedStyle(n)}catch(s){}if("undefined"==typeof r||null===r)return i.push(n),i;var a=r,f=a.overflow,l=a.overflowX,h=a.overflowY;/(auto|scroll|overlay)/.test(f+h+l)&&("absolute"!==o||["relative","absolute","fixed"].indexOf(r.position)>=0)&&i.push(n)}return i.push(t.ownerDocument.body),t.ownerDocument!==document&&i.push(t.ownerDocument.defaultView),i}function i(){O&&document.body.removeChild(O),O=null}function n(t){var o=void 0;t===document?(o=document,t=document.documentElement):o=t.ownerDocument;var i=o.documentElement,n=e(t),r=A();return n.top-=r.top,n.left-=r.left,"undefined"==typeof n.width&&(n.width=document.body.scrollWidth-n.left-n.right),"undefined"==typeof n.height&&(n.height=document.body.scrollHeight-n.top-n.bottom),n.top=n.top-i.clientTop,n.left=n.left-i.clientLeft,n.right=o.body.clientWidth-n.width-n.left,n.bottom=o.body.clientHeight-n.height-n.top,n}function r(t){return t.offsetParent||document.documentElement}function s(){if(T)return T;var t=document.createElement("div");t.style.width="100%",t.style.height="200px";var e=document.createElement("div");a(e.style,{position:"absolute",top:0,left:0,pointerEvents:"none",visibility:"hidden",width:"200px",height:"150px",overflow:"hidden"}),e.appendChild(t),document.body.appendChild(e);var o=t.offsetWidth;e.style.overflow="scroll";var i=t.offsetWidth;o===i&&(i=e.clientWidth),document.body.removeChild(e);var n=o-i;return T={width:n,height:n}}function a(){var t=arguments.length<=0||void 0===arguments[0]?{}:arguments[0],e=[];return Array.prototype.push.apply(e,arguments),e.slice(1).forEach(function(e){if(e)for(var o in e)({}).hasOwnProperty.call(e,o)&&(t[o]=e[o])}),t}function f(t,e){if("undefined"!=typeof t.classList)e.split(" ").forEach(function(e){e.trim()&&t.classList.remove(e)});else{var o=new RegExp("(^| )"+e.split(" ").join("|")+"( |$)","gi"),i=d(t).replace(o," ");u(t,i)}}function l(t,e){if("undefined"!=typeof t.classList)e.split(" ").forEach(function(e){e.trim()&&t.classList.add(e)});else{f(t,e);var o=d(t)+(" "+e);u(t,o)}}function h(t,e){if("undefined"!=typeof t.classList)return t.classList.contains(e);var o=d(t);return new RegExp("(^| )"+e+"( |$)","gi").test(o)}function d(t){return t.className instanceof t.ownerDocument.defaultView.SVGAnimatedString?t.className.baseVal:t.className}function u(t,e){t.setAttribute("class",e)}function p(t,e,o){o.forEach(function(o){e.indexOf(o)===-1&&h(t,o)&&f(t,o)}),e.forEach(function(e){h(t,e)||l(t,e)})}function t(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function c(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function, not "+typeof e);t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,enumerable:!1,writable:!0,configurable:!0}}),e&&(Object.setPrototypeOf?Object.setPrototypeOf(t,e):t.__proto__=e)}function g(t,e){var o=arguments.length<=2||void 0===arguments[2]?1:arguments[2];return t+o>=e&&e>=t-o}function m(){return"object"==typeof performance&&"function"==typeof performance.now?performance.now():+new Date}function v(){for(var t={top:0,left:0},e=arguments.length,o=Array(e),i=0;i<e;i++)o[i]=arguments[i];return o.forEach(function(e){var o=e.top,i=e.left;"string"==typeof o&&(o=parseFloat(o,10)),"string"==typeof i&&(i=parseFloat(i,10)),t.top+=o,t.left+=i}),t}function y(t,e){return"string"==typeof t.left&&t.left.indexOf("%")!==-1&&(t.left=parseFloat(t.left,10)/100*e.width),"string"==typeof t.top&&t.top.indexOf("%")!==-1&&(t.top=parseFloat(t.top,10)/100*e.height),t}function b(t,e){return"scrollParent"===e?e=t.scrollParents[0]:"window"===e&&(e=[pageXOffset,pageYOffset,innerWidth+pageXOffset,innerHeight+pageYOffset]),e===document&&(e=e.documentElement),"undefined"!=typeof e.nodeType&&!function(){var t=e,o=n(e),i=o,r=getComputedStyle(e);if(e=[i.left,i.top,o.width+i.left,o.height+i.top],t.ownerDocument!==document){var s=t.ownerDocument.defaultView;e[0]+=s.pageXOffset,e[1]+=s.pageYOffset,e[2]+=s.pageXOffset,e[3]+=s.pageYOffset}I.forEach(function(t,o){t=t[0].toUpperCase()+t.substr(1),"Top"===t||"Left"===t?e[o]+=parseFloat(r["border"+t+"Width"]):e[o]-=parseFloat(r["border"+t+"Width"])})}(),e}var w=function(){function t(t,e){for(var o=0;o<e.length;o++){var i=e[o];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(t,i.key,i)}}return function(e,o,i){return o&&t(e.prototype,o),i&&t(e,i),e}}(),C=void 0;"undefined"==typeof C&&(C={modules:[]});var O=null,E=function(){var t=0;return function(){return++t}}(),x={},A=function(){var t=O;t&&document.body.contains(t)||(t=document.createElement("div"),t.setAttribute("data-tether-id",E()),a(t.style,{top:0,left:0,position:"absolute"}),document.body.appendChild(t),O=t);var o=t.getAttribute("data-tether-id");return"undefined"==typeof x[o]&&(x[o]=e(t),S(function(){delete x[o]})),x[o]},T=null,P=[],S=function(t){P.push(t)},W=function(){for(var t=void 0;t=P.pop();)t()},M=function(){function e(){t(this,e)}return w(e,[{key:"on",value:function(t,e,o){var i=!(arguments.length<=3||void 0===arguments[3])&&arguments[3];"undefined"==typeof this.bindings&&(this.bindings={}),"undefined"==typeof this.bindings[t]&&(this.bindings[t]=[]),this.bindings[t].push({handler:e,ctx:o,once:i})}},{key:"once",value:function(t,e,o){this.on(t,e,o,!0)}},{key:"off",value:function(t,e){if("undefined"!=typeof this.bindings&&"undefined"!=typeof this.bindings[t])if("undefined"==typeof e)delete this.bindings[t];else for(var o=0;o<this.bindings[t].length;)this.bindings[t][o].handler===e?this.bindings[t].splice(o,1):++o}},{key:"trigger",value:function(t){if("undefined"!=typeof this.bindings&&this.bindings[t]){for(var e=0,o=arguments.length,i=Array(o>1?o-1:0),n=1;n<o;n++)i[n-1]=arguments[n];for(;e<this.bindings[t].length;){var r=this.bindings[t][e],s=r.handler,a=r.ctx,f=r.once,l=a;"undefined"==typeof l&&(l=this),s.apply(l,i),f?this.bindings[t].splice(e,1):++e}}}}]),e}();C.Utils={getActualBoundingClientRect:e,getScrollParents:o,getBounds:n,getOffsetParent:r,extend:a,addClass:l,removeClass:f,hasClass:h,updateClasses:p,defer:S,flush:W,uniqueId:E,Evented:M,getScrollBarSize:s,removeUtilElements:i};var k=function(){function t(t,e){var o=[],i=!0,n=!1,r=void 0;try{for(var s,a=t[Symbol.iterator]();!(i=(s=a.next()).done)&&(o.push(s.value),!e||o.length!==e);i=!0);}catch(f){n=!0,r=f}finally{try{!i&&a["return"]&&a["return"]()}finally{if(n)throw r}}return o}return function(e,o){if(Array.isArray(e))return e;if(Symbol.iterator in Object(e))return t(e,o);throw new TypeError("Invalid attempt to destructure non-iterable instance")}}(),w=function(){function t(t,e){for(var o=0;o<e.length;o++){var i=e[o];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(t,i.key,i)}}return function(e,o,i){return o&&t(e.prototype,o),i&&t(e,i),e}}(),_=function(t,e,o){for(var i=!0;i;){var n=t,r=e,s=o;i=!1,null===n&&(n=Function.prototype);var a=Object.getOwnPropertyDescriptor(n,r);if(void 0!==a){if("value"in a)return a.value;var f=a.get;if(void 0===f)return;return f.call(s)}var l=Object.getPrototypeOf(n);if(null===l)return;t=l,e=r,o=s,i=!0,a=l=void 0}};if("undefined"==typeof C)throw new Error("You must include the utils.js file before tether.js");var z=C.Utils,o=z.getScrollParents,n=z.getBounds,r=z.getOffsetParent,a=z.extend,l=z.addClass,f=z.removeClass,p=z.updateClasses,S=z.defer,W=z.flush,s=z.getScrollBarSize,i=z.removeUtilElements,B=function(){if("undefined"==typeof document)return"";for(var t=document.createElement("div"),e=["transform","WebkitTransform","OTransform","MozTransform","msTransform"],o=0;o<e.length;++o){var i=e[o];if(void 0!==t.style[i])return i}}(),j=[],F=function(){j.forEach(function(t){t.position(!1)}),W()};!function(){var t=null,e=null,o=null,i=function 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o=this;t(this,h),_(Object.getPrototypeOf(h.prototype),"constructor",this).call(this),this.position=this.position.bind(this),j.push(this),this.history=[],this.setOptions(e,!1),C.modules.forEach(function(t){"undefined"!=typeof t.initialize&&t.initialize.call(o)}),this.position()}return c(h,e),w(h,[{key:"getClass",value:function(){var t=arguments.length<=0||void 0===arguments[0]?"":arguments[0],e=this.options.classes;return"undefined"!=typeof e&&e[t]?this.options.classes[t]:this.options.classPrefix?this.options.classPrefix+"-"+t:t}},{key:"setOptions",value:function(t){var e=this,i=arguments.length<=1||void 0===arguments[1]||arguments[1],n={offset:"0 0",targetOffset:"0 0",targetAttachment:"auto auto",classPrefix:"tether"};this.options=a(n,t);var r=this.options,s=r.element,f=r.target,h=r.targetModifier;if(this.element=s,this.target=f,this.targetModifier=h,"viewport"===this.target?(this.target=document.body,this.targetModifier="visible"):"scroll-handle"===this.target&&(this.target=document.body,this.targetModifier="scroll-handle"),["element","target"].forEach(function(t){if("undefined"==typeof e[t])throw new Error("Tether Error: Both element and target must be defined");"undefined"!=typeof e[t].jquery?e[t]=e[t][0]:"string"==typeof e[t]&&(e[t]=document.querySelector(e[t]))}),l(this.element,this.getClass("element")),this.options.addTargetClasses!==!1&&l(this.target,this.getClass("target")),!this.options.attachment)throw new Error("Tether Error: You must provide an attachment");this.targetAttachment=R(this.options.targetAttachment),this.attachment=R(this.options.attachment),this.offset=N(this.options.offset),this.targetOffset=N(this.options.targetOffset),"undefined"!=typeof this.scrollParents&&this.disable(),"scroll-handle"===this.targetModifier?this.scrollParents=[this.target]:this.scrollParents=o(this.target),this.options.enabled!==!1&&this.enable(i)}},{key:"getTargetBounds",value:function(){if("undefined"==typeof this.targetModifier)return n(this.target);if("visible"===this.targetModifier){if(this.target===document.body)return{top:pageYOffset,left:pageXOffset,height:innerHeight,width:innerWidth};var t=n(this.target),e={height:t.height,width:t.width,top:t.top,left:t.left};return e.height=Math.min(e.height,t.height-(pageYOffset-t.top)),e.height=Math.min(e.height,t.height-(t.top+t.height-(pageYOffset+innerHeight))),e.height=Math.min(innerHeight,e.height),e.height-=2,e.width=Math.min(e.width,t.width-(pageXOffset-t.left)),e.width=Math.min(e.width,t.width-(t.left+t.width-(pageXOffset+innerWidth))),e.width=Math.min(innerWidth,e.width),e.width-=2,e.top<pageYOffset&&(e.top=pageYOffset),e.left<pageXOffset&&(e.left=pageXOffset),e}if("scroll-handle"===this.targetModifier){var t=void 0,o=this.target;o===document.body?(o=document.documentElement,t={left:pageXOffset,top:pageYOffset,height:innerHeight,width:innerWidth}):t=n(o);var i=getComputedStyle(o),r=o.scrollWidth>o.clientWidth||[i.overflow,i.overflowX].indexOf("scroll")>=0||this.target!==document.body,s=0;r&&(s=15);var a=t.height-parseFloat(i.borderTopWidth)-parseFloat(i.borderBottomWidth)-s,e={width:15,height:.975*a*(a/o.scrollHeight),left:t.left+t.width-parseFloat(i.borderLeftWidth)-15},f=0;a<408&&this.target===document.body&&(f=-11e-5*Math.pow(a,2)-.00727*a+22.58),this.target!==document.body&&(e.height=Math.max(e.height,24));var l=this.target.scrollTop/(o.scrollHeight-a);return e.top=l*(a-e.height-f)+t.top+parseFloat(i.borderTopWidth),this.target===document.body&&(e.height=Math.max(e.height,24)),e}}},{key:"clearCache",value:function(){this._cache={}}},{key:"cache",value:function(t,e){return"undefined"==typeof this._cache&&(this._cache={}),"undefined"==typeof this._cache[t]&&(this._cache[t]=e.call(this)),this._cache[t]}},{key:"enable",value:function(){var t=this,e=arguments.length<=0||void 0===arguments[0]||arguments[0];this.options.addTargetClasses!==!1&&l(this.target,this.getClass("enabled")),l(this.element,this.getClass("enabled")),this.enabled=!0,this.scrollParents.forEach(function(e){e!==t.target.ownerDocument&&e.addEventListener("scroll",t.position)}),e&&this.position()}},{key:"disable",value:function(){var t=this;f(this.target,this.getClass("enabled")),f(this.element,this.getClass("enabled")),this.enabled=!1,"undefined"!=typeof this.scrollParents&&this.scrollParents.forEach(function(e){e.removeEventListener("scroll",t.position)})}},{key:"destroy",value:function(){var t=this;this.disable(),j.forEach(function(e,o){e===t&&j.splice(o,1)}),0===j.length&&i()}},{key:"updateAttachClasses",value:function(t,e){var o=this;t=t||this.attachment,e=e||this.targetAttachment;var i=["left","top","bottom","right","middle","center"];"undefined"!=typeof this._addAttachClasses&&this._addAttachClasses.length&&this._addAttachClasses.splice(0,this._addAttachClasses.length),"undefined"==typeof this._addAttachClasses&&(this._addAttachClasses=[]);var n=this._addAttachClasses;t.top&&n.push(this.getClass("element-attached")+"-"+t.top),t.left&&n.push(this.getClass("element-attached")+"-"+t.left),e.top&&n.push(this.getClass("target-attached")+"-"+e.top),e.left&&n.push(this.getClass("target-attached")+"-"+e.left);var r=[];i.forEach(function(t){r.push(o.getClass("element-attached")+"-"+t),r.push(o.getClass("target-attached")+"-"+t)}),S(function(){"undefined"!=typeof o._addAttachClasses&&(p(o.element,o._addAttachClasses,r),o.options.addTargetClasses!==!1&&p(o.target,o._addAttachClasses,r),delete o._addAttachClasses)})}},{key:"position",value:function(){var t=this,e=arguments.length<=0||void 0===arguments[0]||arguments[0];if(this.enabled){this.clearCache();var o=X(this.targetAttachment,this.attachment);this.updateAttachClasses(this.attachment,o);var 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