diff --git a/edit/preinit.js b/edit/preinit.js
index b651338d..f62cd346 100644
--- a/edit/preinit.js
+++ b/edit/preinit.js
@@ -10,9 +10,9 @@ define(require => {
     tryJSONparse,
   } = require('/js/toolbox');
   const {$, waitForSelector} = require('/js/dom');
+  const {MozDocMapper} = require('/js/sections-util');
   const prefs = require('/js/prefs');
   const editor = require('./editor');
-  const util = require('./util');
 
   const lazyKeymaps = {
     emacs: '/vendor/codemirror/keymap/emacs',
@@ -114,7 +114,7 @@ define(require => {
         '',
       enabled: true,
       sections: [
-        util.DocFuncMapper.toSection([...params], {code: ''}),
+        MozDocMapper.toSection([...params], {code: ''}),
       ],
     };
     // switching the mode here to show the correct page ASAP, usually before DOMContentLoaded
diff --git a/edit/sections-editor-section.js b/edit/sections-editor-section.js
index 683160f5..4bb13757 100644
--- a/edit/sections-editor-section.js
+++ b/edit/sections-editor-section.js
@@ -5,10 +5,11 @@ define(require => {
   const {$} = require('/js/dom');
   const t = require('/js/localization');
   const prefs = require('/js/prefs');
+  const {MozDocMapper} = require('/js/sections-util');
   const cmFactory = require('./codemirror-factory');
   const editor = require('./editor');
   const linterMan = require('./linter-manager');
-  const {DocFuncMapper, trimCommentLabel} = require('./util');
+  const {trimCommentLabel} = require('./util');
   /** @type {RegExpTester} */
   let regExpTester;
 
@@ -40,7 +41,7 @@ define(require => {
 
     const appliesToContainer = $('.applies-to-list', el);
     const appliesTo = [];
-    DocFuncMapper.forEachProp(originalSection, (type, value) =>
+    MozDocMapper.forEachProp(originalSection, (type, value) =>
       insertApplyAfter({type, value}));
     if (!appliesTo.length) {
       insertApplyAfter({all: true});
@@ -61,7 +62,7 @@ define(require => {
       appliesTo,
       getModel() {
         const items = appliesTo.map(a => !a.all && [a.type, a.value]);
-        return DocFuncMapper.toSection(items, {code: cm.getValue()});
+        return MozDocMapper.toSection(items, {code: cm.getValue()});
       },
       remove() {
         linterMan.disableForEditor(cm);
diff --git a/edit/sections-editor.js b/edit/sections-editor.js
index 23088756..8a5b4b40 100644
--- a/edit/sections-editor.js
+++ b/edit/sections-editor.js
@@ -26,7 +26,6 @@ define(require => function SectionsEditor() {
     clipString,
     helpPopup,
     rerouteHotkeys,
-    sectionsToMozFormat,
     showCodeMirrorPopup,
   } = require('./util');
 
@@ -332,9 +331,11 @@ define(require => function SectionsEditor() {
   }
 
   function showMozillaFormat() {
-    const popup = showCodeMirrorPopup(t('styleToMozillaFormatTitle'), '', {readOnly: true});
-    popup.codebox.setValue(sectionsToMozFormat(getModel()));
-    popup.codebox.execCommand('selectAll');
+    require(['/js/sections-util'], util => {
+      const popup = showCodeMirrorPopup(t('styleToMozillaFormatTitle'), '', {readOnly: true});
+      popup.codebox.setValue(util.MozDocMapper.styleToCss(getModel()));
+      popup.codebox.execCommand('selectAll');
+    });
   }
 
   function showMozillaFormatImport(text = '') {
diff --git a/edit/source-editor.js b/edit/source-editor.js
index cf23f702..b6adbc8e 100644
--- a/edit/source-editor.js
+++ b/edit/source-editor.js
@@ -12,6 +12,7 @@ define(require => function SourceEditor() {
   } = require('/js/dom');
   const t = require('/js/localization');
   const prefs = require('/js/prefs');
+  const {MozDocMapper} = require('/js/sections-util');
   const {chromeSync} = require('/js/storage-util');
   const cmFactory = require('./codemirror-factory');
   const editor = require('./editor');
@@ -19,7 +20,6 @@ define(require => function SourceEditor() {
   const linterMan = require('./linter-manager');
   const sectionFinder = require('./moz-section-finder');
   const sectionWidget = require('./moz-section-widget');
-  const {sectionsToMozFormat} = require('./util');
 
   const {CodeMirror} = cmFactory;
   const {style, /** @type DirtyReporter */dirty} = editor;
@@ -158,10 +158,10 @@ define(require => function SourceEditor() {
   async function setupNewStyle(style) {
     style.sections[0].code = ' '.repeat(prefs.get('editor.tabSize')) +
       `/* ${t('usercssReplaceTemplateSectionBody')} */`;
-    let section = sectionsToMozFormat(style);
+    let section = MozDocMapper.styleToCss(style);
     if (!section.includes('@-moz-document')) {
       style.sections[0].domains = ['example.com'];
-      section = sectionsToMozFormat(style);
+      section = MozDocMapper.styleToCss(style);
     }
     const DEFAULT_CODE = `
       /* ==UserStyle==
diff --git a/edit/util.js b/edit/util.js
index ebc72b1e..fbf5c40f 100644
--- a/edit/util.js
+++ b/edit/util.js
@@ -13,49 +13,6 @@ define(require => {
 
   let CodeMirror;
 
-  // TODO: maybe move to sections-util.js
-  const DocFuncMapper = {
-    TO_CSS: {
-      urls: 'url',
-      urlPrefixes: 'url-prefix',
-      domains: 'domain',
-      regexps: 'regexp',
-    },
-    FROM_CSS: {
-      'url': 'urls',
-      'url-prefix': 'urlPrefixes',
-      'domain': 'domains',
-      'regexp': 'regexps',
-    },
-    /**
-     * @param {Object} section
-     * @param {function(func:string, value:string)} fn
-     */
-    forEachProp(section, fn) {
-      for (const [propName, func] of Object.entries(DocFuncMapper.TO_CSS)) {
-        const props = section[propName];
-        if (props) props.forEach(value => fn(func, value));
-      }
-    },
-    /**
-     * @param {Array<?[type,value]>} funcItems
-     * @param {?Object} [section]
-     * @returns {Object} section
-     */
-    toSection(funcItems, section = {}) {
-      for (const item of funcItems) {
-        const [func, value] = item || [];
-        const propName = DocFuncMapper.FROM_CSS[func];
-        if (propName) {
-          const props = section[propName] || (section[propName] = []);
-          if (Array.isArray(value)) props.push(...value);
-          else props.push(value);
-        }
-      }
-      return section;
-    },
-  };
-
   const util = {
 
     get CodeMirror() {
@@ -64,7 +21,6 @@ define(require => {
     set CodeMirror(val) {
       CodeMirror = val;
     },
-    DocFuncMapper,
 
     helpPopup: {
       show(title = '', body) {
@@ -169,17 +125,6 @@ define(require => {
       require(['./reroute-hotkeys'], res => res(...args));
     },
 
-    sectionsToMozFormat(style) {
-      return style.sections.map(section => {
-        const cssFuncs = [];
-        DocFuncMapper.forEachProp(section, (type, value) =>
-          cssFuncs.push(`${type}("${value.replace(/\\/g, '\\\\')}")`));
-        return cssFuncs.length ?
-          `@-moz-document ${cssFuncs.join(', ')} {\n${section.code}\n}` :
-          section.code;
-      }).join('\n\n');
-    },
-
     showCodeMirrorPopup(title, html, options) {
       const popup = util.helpPopup.show(title, html);
       popup.classList.add('big');
diff --git a/js/moz-parser.js b/js/moz-parser.js
index f64f199f..08a7c51c 100644
--- a/js/moz-parser.js
+++ b/js/moz-parser.js
@@ -2,7 +2,8 @@
 
 define([
   '/js/csslint/parserlib',
-], parserlib => ({
+  '/js/sections-util',
+], (parserlib, util) => ({
 
   /**
    * Extracts @-moz-document blocks into sections and the code between them into global sections.
@@ -16,12 +17,6 @@ define([
    * @property {?number} lastStyleId
    */
   extractSections: function fn({code, styleId, fast = true}) {
-    const CssToProperty = {
-      'url': 'urls',
-      'url-prefix': 'urlPrefixes',
-      'domain': 'domains',
-      'regexp': 'regexps',
-    };
     const hasSingleEscapes = /([^\\]|^)\\([^\\]|$)/;
     const parser = new parserlib.css.Parser({
       starHack: true,
@@ -57,7 +52,7 @@ define([
         lastSection.code = '';
       }
       for (const {name, expr, uri} of e.functions) {
-        const aType = CssToProperty[name.toLowerCase()];
+        const aType = util.MozDocMapper.FROM_CSS[name.toLowerCase()];
         const p0 = expr && expr.parts[0];
         if (p0 && aType === 'regexps') {
           const s = p0.text;
diff --git a/js/sections-util.js b/js/sections-util.js
index e09f8c74..306e8711 100644
--- a/js/sections-util.js
+++ b/js/sections-util.js
@@ -1,7 +1,65 @@
 'use strict';
 
 define(require => {
-  const exports = {
+  const util = {
+
+    MozDocMapper: {
+      TO_CSS: {
+        urls: 'url',
+        urlPrefixes: 'url-prefix',
+        domains: 'domain',
+        regexps: 'regexp',
+      },
+      FROM_CSS: {
+        'url': 'urls',
+        'url-prefix': 'urlPrefixes',
+        'domain': 'domains',
+        'regexp': 'regexps',
+      },
+      /**
+       * @param {Object} section
+       * @param {function(func:string, value:string)} fn
+       */
+      forEachProp(section, fn) {
+        for (const [propName, func] of Object.entries(util.MozDocMapper.TO_CSS)) {
+          const props = section[propName];
+          if (props) props.forEach(value => fn(func, value));
+        }
+      },
+      /**
+       * @param {Array<?[type,value]>} funcItems
+       * @param {?Object} [section]
+       * @returns {Object} section
+       */
+      toSection(funcItems, section = {}) {
+        for (const item of funcItems) {
+          const [func, value] = item || [];
+          const propName = util.MozDocMapper.FROM_CSS[func];
+          if (propName) {
+            const props = section[propName] || (section[propName] = []);
+            if (Array.isArray(value)) props.push(...value);
+            else props.push(value);
+          }
+        }
+        return section;
+      },
+      /**
+       * @param {StyleObj} style
+       * @returns {string}
+       */
+      styleToCss(style) {
+        const res = [];
+        for (const section of style.sections) {
+          const funcs = [];
+          util.MozDocMapper.forEachProp(section, (type, value) =>
+            funcs.push(`${type}("${value.replace(/[\\"]/g, '\\$&')}")`));
+          res.push(funcs.length
+            ? `@-moz-document ${funcs.join(', ')} {\n${section.code}\n}`
+            : section.code);
+        }
+        return res.join('\n\n');
+      },
+    },
 
     async calcStyleDigest(style) {
       const src = style.usercssData
@@ -90,5 +148,5 @@ define(require => {
     }));
   }
 
-  return exports;
+  return util;
 });