Revert "Add: save usercss from multi-section editor"

This reverts commit da5626a6d7.

_locales/en/messages.json

@@ -787,18 +787,10 @@
     "message": "Enter a name.",
     "description": "Error displayed when user saves without providing a name"
   },
-  "stylePasteMozillaFormat": {
-    "message": "The code you pasted looks like mozilla format style. Would you like to import it?",
-    "description": "The confirmation to import mozilla format style from pasted text"
-  },
   "styleSaveLabel": {
     "message": "Save",
     "description": "Label for save button for style editing"
   },
-  "styleSaveAsUsercss": {
-    "message": "The source code contains usercss metadata. Would you like to save the source code as usercss?",
-    "description": "The confirmation to create usercss from the editor"
-  },
   "styleSectionsTitle": {
     "message": "Sections",
     "description": "Title for the style sections section"

edit/edit.js

@@ -306,8 +306,7 @@ function setupCodeMirror(textarea, index) {
     if (
       text.includes('@-moz-document') &&
       text.replace(/\/\*[\s\S]*?\*\//g, '')
-        .match(/@-moz-document[\s\r\n]+(url|url-prefix|domain|regexp)\(/) &&
-      confirm(t('stylePasteMozillaFormat'))
+        .match(/@-moz-document[\s\r\n]+(url|url-prefix|domain|regexp)\(/)
     ) {
       event.preventDefault();
       fromMozillaFormat();
@@ -1487,28 +1486,7 @@ function save() {
   editor.save();
 }
 
-function isUsercssSourceCode() {
-  const sourceCode = editors[0].getValue();
-  return /==UserStyle==[\s\S]+==\/UserStyle==/i.test(sourceCode);
-}
-
 function saveSectionStyle() {
-  if (!styleId && isUsercssSourceCode() && confirm(t('styleSaveAsUsercss'))) {
-    const sourceCode = editors[0].getValue();
-    onBackgroundReady()
-      .then(() => BG.usercssHelper.save({
-        reason: 'editSave',
-        sourceCode,
-        enabled: $('#enabled').checked
-      }))
-      .then(style => {
-        window.onbeforeunload = null;
-        location.href = `/edit.html?id=${style.id}`;
-      })
-      .catch(alert);
-    return;
-  }
-
   updateLintReportIfEnabled(null, 0);
 
   // save the contents of the CodeMirror editors back into the textareas