diff --git a/Core.js b/Core.js
index c922743..11b43f6 100644
--- a/Core.js
+++ b/Core.js
@@ -5,8 +5,8 @@
 class SimonUp {
     constructor() {
         this.plugins = [];
-        this.headings = [];      // Speichert alle gefundenen Überschriften für das TOC
-        this.counters = [0, 0, 0, 0, 0, 0]; // Zähler für die hierarchischen Ebenen 1 bis 6
+        this.headings = [];
+        this.counters = [0, 0, 0, 0, 0, 0];
     }
 
     /**
@@ -26,15 +26,23 @@ class SimonUp {
 
         let html = text;
 
-        for (const plugin of this.plugins) {
-            if (plugin.before) html = plugin.before(html);
+        if (this.plugins && this.plugins.length > 0) {
+            for (let i = 0; i < this.plugins.length; i++) {
+                if (this.plugins[i].before) {
+                    html = this.plugins[i].before(html);
+                }
+            }
         }
 
         html = this._parseBlocks(html);
         html = this._injectTOC(html);
 
-        for (const plugin of this.plugins) {
-            if (plugin.after) html = plugin.after(html);
+        if (this.plugins && this.plugins.length > 0) {
+            for (let i = 0; i < this.plugins.length; i++) {
+                if (this.plugins[i].after) {
+                    html = this.plugins[i].after(html);
+                }
+            }
         }
 
         return html;
@@ -86,10 +94,10 @@ class SimonUp {
                 if (trimmed === '___') {
                     result.push('<hr>');
                 } else if (trimmed.startsWith('- ')) {
-                    result.push(`<ul-item>${this._parseInline(line.replace(/^\s*-\s+/, ''))}</ul-item>`);
+                    result.push('<ul-item>' + this._parseInline(line.replace(/^\s*-\s+/, '')) + '</ul-item>');
                 } else if (/^\d+\.\s+/.test(trimmed)) {
                     let cleanLine = line.replace(/^\s*\d+\.\s+/, '');
-                    result.push(`<ol-item>${this._parseInline(cleanLine)}</ol-item>`);
+                    result.push('<ol-item>' + this._parseInline(cleanLine) + '</ol-item>');
                 } else {
                     result.push(this._parseInline(line));
                 }
@@ -107,40 +115,48 @@ class SimonUp {
 
         switch (type) {
             case 'toc':
-                let tocWrapper = ``;
+                let tocWrapper = '';
                 if (meta || content.trim()) {
-                    tocWrapper = `<div class="simonup-toc-wrapper">\n`;
-                    if (meta) tocWrapper += `<h2>${meta}</h2>\n`;
-                    if (content.trim()) {
-                        const intro = lines.map(l => this._parseInline(l)).join('<br>');
-                        tocWrapper += `<p class="toc-intro">${intro}</p>\n`;
+                    tocWrapper = '<div class="simonup-toc-wrapper">\n';
+                    if (meta) {
+                        tocWrapper += '<h2>' + meta + '</h2>\n';
                     }
-                    tocWrapper += `\n</div>`;
+                    if (content.trim()) {
+                        let self = this;
+                        const intro = lines.map(function(l) { return self._parseInline(l); }).join('<br>');
+                        tocWrapper += '<p class="toc-intro">' + intro + '</p>\n';
+                    }
+                    tocWrapper += '\n</div>';
                 }
                 return tocWrapper;
 
             case 'c': 
-                const langClass = meta ? ` class="language-${meta}"` : '';
+                const langClass = meta ? ' class="language-' + meta + '"' : '';
                 const escapedCode = content.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
-                return `<pre><code${langClass}>${escapedCode}</code></pre>`;
+                return '<pre><code' + langClass + '>' + escapedCode + '</code></pre>';
 
             case 'q': 
-                return `<blockquote>${lines.map(l => this._parseInline(l)).join('<br>')}</blockquote>`;
+                let selfQ = this;
+                return '<blockquote>' + lines.map(function(l) { return selfQ._parseInline(l); }).join('<br>') + '</blockquote>';
 
             case 'b': 
-                return `<div class="bible-block">${lines.map(l => this._parseInline(l)).join('<br>')}</div>`;
+                let selfB = this;
+                return '<div class="bible-block">' + lines.map(function(l) { return selfB._parseInline(l); }).join('<br>') + '</div>';
 
             case 'f': 
-                return `<details>\n<summary>${meta || 'Details'}</summary>\n<p>${lines.map(l => this._parseInline(l)).join('<br>')}</p>\n</details>`;
+                let selfF = this;
+                return '<details>\n<summary>' + (meta || 'Details') + '</summary>\n<p>' + lines.map(function(l) { return selfF._parseInline(l); }).join('<br>') + '</p>\n</details>';
 
             case 'i': 
-                return `<div class="infobox" style="border-left: 4px solid ${meta || '#ff6347'}; padding: 10px; margin: 10px 0; background: #f8f9fa;">\n${lines.map(l => this._parseInline(l)).join('<br>')}\n</div>`;
+                let selfI = this;
+                return '<div class="infobox" style="border-left: 4px solid ' + (meta || '#ff6347') + '; padding: 10px; margin: 10px 0; background: #f8f9fa;">\n' + lines.map(function(l) { return selfI._parseInline(l); }).join('<br>') + '\n</div>';
 
             case 't': 
                 return this._renderTable(meta, lines);
 
             default:
-                return `<div class="block-${type}">${lines.map(l => this._parseInline(l)).join('<br>')}</div>`;
+                let selfDef = this;
+                return '<div class="block-' + type + '">' + lines.map(function(l) { return selfDef._parseInline(l); }).join('<br>') + '</div>';
         }
     }
 
@@ -151,13 +167,15 @@ class SimonUp {
         let tableHtml = '<table>\n';
         let currentCells = [];
         let cellBuffer = [];
+        let self = this;
 
-        for (let line of lines) {
+        for (let i = 0; i < lines.length; i++) {
+            let line = lines[i];
             let parts = line.split('|');
-            for (let i = 0; i < parts.length; i++) {
-                let part = parts[i];
+            for (let j = 0; j < parts.length; j++) {
+                let part = parts[j];
                 
-                if (i === parts.length - 1) {
+                if (j === parts.length - 1) {
                     if (part.trim() !== '') {
                         cellBuffer.push(part);
                     }
@@ -173,7 +191,10 @@ class SimonUp {
             }
 
             if (line.endsWith('|') && currentCells.length > 0) {
-                tableHtml += '<tr>\n' + currentCells.map(c => `<td>${this._parseInline(c.trim()).replace(/\n/g, '<br>')}</td>`).join('\n') + '\n</tr>\n';
+                let rowContent = currentCells.map(function(c) {
+                    return '<td>' + self._parseInline(c.trim()).replace(/\n/g, '<br>') + '</td>';
+                }).join('\n');
+                tableHtml += '<tr>\n' + rowContent + '\n</tr>\n';
                 currentCells = [];
             }
         }
@@ -189,14 +210,15 @@ class SimonUp {
         let html = text;
 
         const escapes = [];
-        html = html.replace(/\\(.)/g, (match, char) => {
+        html = html.replace(/\\(.)/g, function(match, char) {
             escapes.push(char);
-            return ``;
+            return '';
         });
 
         html = html.replace(/\/\/(\s|$)/g, '$1');
 
-        const processHeading = (pattern, callback) => {
+        let self = this;
+        const processHeading = function(pattern, callback) {
             let match;
             while ((match = pattern.exec(html)) !== null) {
                 const fullMatch = match[0];
@@ -216,22 +238,22 @@ class SimonUp {
             }
         };
 
-        processHeading(/^([1-6])x#\s*(.*)/g, (level, title, rest) => {
-            const numStr = this._getAutoNumber(level);
-            const fullTitle = `${numStr} ${title}`;
-            const id = this._slugify(fullTitle);
-            this.headings.push({ level, text: fullTitle, id });
-            return `<h${level} id="${id}">${fullTitle}</h${level}>${rest}`;
+        processHeading(/^([1-6])x#\s*(.*)/g, function(level, title, rest) {
+            const numStr = self._getAutoNumber(level);
+            const fullTitle = numStr + ' ' + title;
+            const id = self._slugify(fullTitle);
+            self.headings.push({ level: level, text: fullTitle, id: id });
+            return '<h' + level + ' id="' + id + '">' + fullTitle + '</h' + level + '>' + rest;
         });
 
-        processHeading(/^([1-6])-#\s*(.*)/g, (level, title, rest) => {
-            return `<h${level}>${title}</h${level}>${rest}`;
+        processHeading(/^([1-6])-#\s*(.*)/g, function(level, title, rest) {
+            return '<h' + level + '>' + title + '</h' + level + '>' + rest;
         });
 
-        processHeading(/^([1-6])#\s*(.*)/g, (level, title, rest) => {
-            const id = this._slugify(title);
-            this.headings.push({ level, text: title, id });
-            return `<h${level} id="${id}">${title}</h${level}>${rest}`;
+        processHeading(/^([1-6])#\s*(.*)/g, function(level, title, rest) {
+            const id = self._slugify(title);
+            self.headings.push({ level: level, text: title, id: id });
+            return '<h' + level + ' id="' + id + '">' + title + '</h' + level + '>' + rest;
         });
 
         const inlineRules = [
@@ -246,20 +268,20 @@ class SimonUp {
             { tag: 'code', symbol: '`' }
         ];
 
-        // Hier nutzen wir nun eine absolut sichere String-Verkettung für den RegExp-Konstruktor
-        for (const rule of inlineRules) {
+        for (let k = 0; k < inlineRules.length; k++) {
+            let rule = inlineRules[k];
             let regex = new RegExp(rule.symbol + '(.+?)\\x2F' + rule.symbol, 'g');
-            html = html.replace(regex, `<${rule.tag}>$1</${rule.tag.split(' ')[0]}>`);
+            html = html.replace(regex, '<' + rule.tag + '>$1</' + rule.tag.split(' ')[0] + '>');
 
             let resetRegex = new RegExp(rule.symbol + '(.+?)(?=)', 'g');
-            html = html.replace(resetRegex, `<${rule.tag}>$1</${rule.tag.split(' ')[0]}>`);
+            html = html.replace(resetRegex, '<' + rule.tag + '>$1</' + rule.tag.split(' ')[0] + '>');
         }
         
         html = html.replace(//g, '');
 
-        const alignMap = { l: 'left', r: 'right', c: 'center', j: 'justify' };
-        html = html.replace(/>([lrcj])\s+(.+?)\s*\/>/g, (m, dir, content) => {
-            return `<div style="text-align: ${alignMap[dir]};">${content}</div>`;
+        const alignMap = { 'l': 'left', 'r': 'right', 'c': 'center', 'j': 'justify' };
+        html = html.replace(/>([lrcj])\s+(.+?)\s*\/>/g, function(m, dir, content) {
+            return '<div style="text-align: ' + alignMap[dir] + ';">' + content + '</div>';
         });
 
         html = html.replace(/!\[([^\]]+)\s+w:(\d+)\]\(([^)]+)\)/g, '<img src="$3" alt="$1" style="width: $2px; height: auto;">');
@@ -270,7 +292,9 @@ class SimonUp {
         html = html.replace(/\^x\[([^\]]+)\]\^/g, '<span class="footnote-auto" title="$1">[*]</span>'); 
         html = html.replace(/\^(\d+)\[([^\]]+)\]\^/g, '<sup class="footnote-manual" title="$2">[$1]</sup>');
 
-        html = html.replace(//g, (match, idx) => escapes[idx]);
+        html = html.replace(//g, function(match, idx) {
+            return escapes[idx];
+        });
 
         return html;
     }
@@ -281,7 +305,9 @@ class SimonUp {
     _getAutoNumber(level) {
         let idx = level - 1;
         this.counters[idx]++;
-        for (let i = idx + 1; i < 6; i++) this.counters[i] = 0;
+        for (let i = idx + 1; i < 6; i++) {
+            this.counters[i] = 0;
+        }
         let activeParts = this.counters.slice(0, level);
         return activeParts.join('.') + '.';
     }
@@ -305,14 +331,15 @@ class SimonUp {
         let tocListHtml = '<div class="simonup-toc">\n<ul>\n';
         let currentLevel = 1;
 
-        for (const heading of this.headings) {
+        for (let i = 0; i < this.headings.length; i++) {
+            let heading = this.headings[i];
             if (heading.level > currentLevel) {
                 tocListHtml += '<ul>\n'.repeat(heading.level - currentLevel);
             } else if (heading.level < currentLevel) {
                 tocListHtml += '</ul>\n'.repeat(currentLevel - heading.level);
             }
             currentLevel = heading.level;
-            tocListHtml += `<li><a href="#${heading.id}">${heading.text}</a></li>\n`;
+            tocListHtml += '<li><a href="#' + heading.id + '">' + heading.text + '</a></li>\n';
         }
         
         if (currentLevel > 1) {
@@ -332,22 +359,24 @@ class SimonUp {
         let listBuffer = [];
         let currentListType = null; 
 
-        const flushList = () => {
+        const flushList = function() {
             if (listBuffer.length > 0) {
-                processed.push(`<${currentListType}>\n` + listBuffer.map(item => `  <li>${item}</li>`).join('\n') + `\n</${currentListType}>`);
+                let items = listBuffer.map(function(item) { return '  <li>' + item + '</li>'; }).join('\n');
+                processed.push('<' + currentListType + '>\n' + items + '\n</' + currentListType + '>');
                 listBuffer = [];
                 currentListType = null;
             }
         };
 
-        const flushParagraph = () => {
+        const flushParagraph = function() {
             if (paragraphBuffer.length > 0) {
-                processed.push(`<p>${paragraphBuffer.join('<br>')}</p>`);
+                processed.push('<p>' + paragraphBuffer.join('<br>') + '</p>');
                 paragraphBuffer = [];
             }
         };
 
-        for (let element of elements) {
+        for (let i = 0; i < elements.length; i++) {
+            let element = elements[i];
             let isUlItem = element.startsWith('<ul-item>');
             let isOlItem = element.startsWith('<ol-item>');