diff --git a/browser/extensions/formautofill/FormAutofillHeuristics.jsm b/browser/extensions/formautofill/FormAutofillHeuristics.jsm
index 52ce7f639a46..f35750130fac 100644
--- a/browser/extensions/formautofill/FormAutofillHeuristics.jsm
+++ b/browser/extensions/formautofill/FormAutofillHeuristics.jsm
@@ -8,7 +8,7 @@
 
 "use strict";
 
-this.EXPORTED_SYMBOLS = ["FormAutofillHeuristics"];
+this.EXPORTED_SYMBOLS = ["FormAutofillHeuristics", "LabelUtils"];
 
 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
 
@@ -182,6 +182,84 @@ class FieldScanner {
   }
 }
 
+this.LabelUtils = {
+  // The tag name list is from Chromium except for "STYLE":
+  // eslint-disable-next-line max-len
+  // https://cs.chromium.org/chromium/src/components/autofill/content/renderer/form_autofill_util.cc?l=216&rcl=d33a171b7c308a64dc3372fac3da2179c63b419e
+  EXCLUDED_TAGS: ["SCRIPT", "NOSCRIPT", "OPTION", "STYLE"],
+  /**
+   * Extract all strings of an element's children to an array.
+   * "element.textContent" is a string which is merged of all children nodes,
+   * and this function provides an array of the strings contains in an element.
+   *
+   * @param  {Object} element
+   *         A DOM element to be extracted.
+   * @returns {Array}
+   *          All strings in an element.
+   */
+  extractLabelStrings(element) {
+    let strings = [];
+    let _extractLabelStrings = (el) => {
+      if (this.EXCLUDED_TAGS.includes(el.tagName)) {
+        return;
+      }
+
+      if (el.nodeType == Ci.nsIDOMNode.TEXT_NODE ||
+          el.childNodes.length == 0) {
+        let trimmedText = el.textContent.trim();
+        if (trimmedText) {
+          strings.push(trimmedText);
+        }
+        return;
+      }
+
+      for (let node of el.childNodes) {
+        if (node.nodeType != Ci.nsIDOMNode.ELEMENT_NODE &&
+            node.nodeType != Ci.nsIDOMNode.TEXT_NODE) {
+          continue;
+        }
+        _extractLabelStrings(node);
+      }
+    };
+    _extractLabelStrings(element);
+    return strings;
+  },
+
+  findLabelElements(element) {
+    let document = element.ownerDocument;
+    let labels = [];
+    // TODO: querySelectorAll is inefficient here. However, bug 1339726 is for
+    // a more efficient implementation from DOM API perspective. This function
+    // should be refined after input.labels API landed.
+    for (let label of document.querySelectorAll("label[for]")) {
+      if (element.id == label.htmlFor) {
+        labels.push(label);
+      }
+    }
+
+    if (labels.length > 0) {
+      log.debug("Label found by ID", element.id);
+      return labels;
+    }
+
+    let parent = element.parentNode;
+    if (!parent) {
+      return [];
+    }
+    do {
+      if (parent.tagName == "LABEL" &&
+          parent.control == element &&
+          !parent.hasAttribute("for")) {
+        log.debug("Label found in input's parent or ancestor.");
+        return [parent];
+      }
+      parent = parent.parentNode;
+    } while (parent);
+
+    return [];
+  },
+};
+
 /**
  * Returns the autocomplete information of fields according to heuristics.
  */
@@ -370,9 +448,9 @@ this.FormAutofillHeuristics = {
       yield element.name;
       if (!labelStrings) {
         labelStrings = [];
-        let labels = FormAutofillUtils.findLabelElements(element);
+        let labels = LabelUtils.findLabelElements(element);
         for (let label of labels) {
-          labelStrings.push(...FormAutofillUtils.extractLabelStrings(label));
+          labelStrings.push(...LabelUtils.extractLabelStrings(label));
         }
       }
       yield *labelStrings;
diff --git a/browser/extensions/formautofill/FormAutofillUtils.jsm b/browser/extensions/formautofill/FormAutofillUtils.jsm
index d596b683ad7e..399ad9d3445c 100644
--- a/browser/extensions/formautofill/FormAutofillUtils.jsm
+++ b/browser/extensions/formautofill/FormAutofillUtils.jsm
@@ -128,82 +128,6 @@ this.FormAutofillUtils = {
     return true;
   },
 
-  // The tag name list is from Chromium except for "STYLE":
-  // eslint-disable-next-line max-len
-  // https://cs.chromium.org/chromium/src/components/autofill/content/renderer/form_autofill_util.cc?l=216&rcl=d33a171b7c308a64dc3372fac3da2179c63b419e
-  EXCLUDED_TAGS: ["SCRIPT", "NOSCRIPT", "OPTION", "STYLE"],
-  /**
-   * Extract all strings of an element's children to an array.
-   * "element.textContent" is a string which is merged of all children nodes,
-   * and this function provides an array of the strings contains in an element.
-   *
-   * @param  {Object} element
-   *         A DOM element to be extracted.
-   * @returns {Array}
-   *          All strings in an element.
-   */
-  extractLabelStrings(element) {
-    let strings = [];
-    let _extractLabelStrings = (el) => {
-      if (this.EXCLUDED_TAGS.includes(el.tagName)) {
-        return;
-      }
-
-      if (el.nodeType == Ci.nsIDOMNode.TEXT_NODE ||
-          el.childNodes.length == 0) {
-        let trimmedText = el.textContent.trim();
-        if (trimmedText) {
-          strings.push(trimmedText);
-        }
-        return;
-      }
-
-      for (let node of el.childNodes) {
-        if (node.nodeType != Ci.nsIDOMNode.ELEMENT_NODE &&
-            node.nodeType != Ci.nsIDOMNode.TEXT_NODE) {
-          continue;
-        }
-        _extractLabelStrings(node);
-      }
-    };
-    _extractLabelStrings(element);
-    return strings;
-  },
-
-  findLabelElements(element) {
-    let document = element.ownerDocument;
-    let labels = [];
-    // TODO: querySelectorAll is inefficient here. However, bug 1339726 is for
-    // a more efficient implementation from DOM API perspective. This function
-    // should be refined after input.labels API landed.
-    for (let label of document.querySelectorAll("label[for]")) {
-      if (element.id == label.htmlFor) {
-        labels.push(label);
-      }
-    }
-
-    if (labels.length > 0) {
-      log.debug("Label found by ID", element.id);
-      return labels;
-    }
-
-    let parent = element.parentNode;
-    if (!parent) {
-      return [];
-    }
-    do {
-      if (parent.tagName == "LABEL" &&
-          parent.control == element &&
-          !parent.hasAttribute("for")) {
-        log.debug("Label found in input's parent or ancestor.");
-        return [parent];
-      }
-      parent = parent.parentNode;
-    } while (parent);
-
-    return [];
-  },
-
   loadDataFromScript(url, sandbox = {}) {
     let scriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"]
                          .getService(Ci.mozIJSSubScriptLoader);
diff --git a/browser/extensions/formautofill/test/unit/test_extractLabelStrings.js b/browser/extensions/formautofill/test/unit/test_extractLabelStrings.js
index cb159c92e5d0..5c0a59f95e9e 100644
--- a/browser/extensions/formautofill/test/unit/test_extractLabelStrings.js
+++ b/browser/extensions/formautofill/test/unit/test_extractLabelStrings.js
@@ -1,6 +1,6 @@
 "use strict";
 
-Cu.import("resource://formautofill/FormAutofillUtils.jsm");
+Cu.import("resource://formautofill/FormAutofillHeuristics.jsm");
 
 const TESTCASES = [
   {
@@ -59,7 +59,7 @@ TESTCASES.forEach(testcase => {
       "http://localhost:8080/test/", testcase.document);
 
     let element = doc.getElementById(testcase.inputId);
-    let strings = FormAutofillUtils.extractLabelStrings(element);
+    let strings = LabelUtils.extractLabelStrings(element);
 
     Assert.deepEqual(strings, testcase.expectedStrings);
   });
diff --git a/browser/extensions/formautofill/test/unit/test_findLabelElements.js b/browser/extensions/formautofill/test/unit/test_findLabelElements.js
index 8aca54d7b0a9..dcdf3670d67a 100644
--- a/browser/extensions/formautofill/test/unit/test_findLabelElements.js
+++ b/browser/extensions/formautofill/test/unit/test_findLabelElements.js
@@ -1,6 +1,6 @@
 "use strict";
 
-Cu.import("resource://formautofill/FormAutofillUtils.jsm");
+Cu.import("resource://formautofill/FormAutofillHeuristics.jsm");
 
 const TESTCASES = [
   {
@@ -83,7 +83,7 @@ TESTCASES.forEach(testcase => {
       "http://localhost:8080/test/", testcase.document);
 
     let input = doc.getElementById(testcase.inputId);
-    let labels = FormAutofillUtils.findLabelElements(input);
+    let labels = LabelUtils.findLabelElements(input);
 
     Assert.deepEqual(labels.map(l => l.id), testcase.expectedLabelIds);
   });
diff --git a/tools/lint/eslint/modules.json b/tools/lint/eslint/modules.json
index 84f15739acac..f2d15cae99c9 100644
--- a/tools/lint/eslint/modules.json
+++ b/tools/lint/eslint/modules.json
@@ -77,6 +77,7 @@
   "Finder.jsm": ["Finder", "GetClipboardSearchString"],
   "forms.js": ["FormEngine", "FormRec", "FormValidator"],
   "forms.jsm": ["FormData"],
+  "FormAutofillHeuristics.jsm": ["FormAutofillHeuristics", "LabelUtils"],
   "FormAutofillSync.jsm": ["AddressesEngine", "CreditCardsEngine"],
   "frame.js": ["Collector", "Runner", "events", "runTestFile", "log", "timers", "persisted", "shutdownApplication"],
   "FrameScriptManager.jsm": ["getNewLoaderID"],