diff --git a/dom/manifest/ImageObjectProcessor.jsm b/dom/manifest/ImageObjectProcessor.jsm
index ab1975e3cea1..d6b23fc8501d 100644
--- a/dom/manifest/ImageObjectProcessor.jsm
+++ b/dom/manifest/ImageObjectProcessor.jsm
@@ -75,7 +75,6 @@ ImageObjectProcessor.prototype.process = function(
       'src': processSrcMember(aImageSpec, aBaseURL),
       'type': processTypeMember(aImageSpec),
       'sizes': processSizesMember(aImageSpec),
-      'density': processDensityMember(aImageSpec),
       'background_color': processBackgroundColorMember(aImageSpec)
     };
   }
@@ -97,13 +96,6 @@ ImageObjectProcessor.prototype.process = function(
     return value || undefined;
   }
 
-  function processDensityMember(aImage) {
-    const value = parseFloat(aImage.density);
-    const validNum = Number.isNaN(value) || value === +Infinity || value <=
-      0;
-    return (validNum) ? 1.0 : value;
-  }
-
   function processSrcMember(aImage, aBaseURL) {
     const spec = {
       objectName: 'image',
diff --git a/dom/manifest/test/mochitest.ini b/dom/manifest/test/mochitest.ini
index 7e2a8e2d679f..7dde4c33b9f0 100644
--- a/dom/manifest/test/mochitest.ini
+++ b/dom/manifest/test/mochitest.ini
@@ -4,7 +4,6 @@ support-files =
 	resource.sjs
 	manifestLoader.html
 [test_ImageObjectProcessor_background_color.html]
-[test_ImageObjectProcessor_density.html]
 [test_ImageObjectProcessor_sizes.html]
 [test_ImageObjectProcessor_src.html]
 [test_ImageObjectProcessor_type.html]
diff --git a/dom/manifest/test/test_ImageObjectProcessor_density.html b/dom/manifest/test/test_ImageObjectProcessor_density.html
deleted file mode 100644
index 28141bde5977..000000000000
--- a/dom/manifest/test/test_ImageObjectProcessor_density.html
+++ /dev/null
@@ -1,57 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<!--
-https://bugzilla.mozilla.org/show_bug.cgi?id=1079453
--->
-<head>
-  <meta charset="utf-8">
-  <title>Test for Bug 1079453</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
-  <script src="common.js"></script>
-  <script>
-/**
- * Image object density member
- * https://w3c.github.io/manifest/#density-member
- **/
-'use strict';
-
-var testIcon = {
-  icons: [{
-    src: 'test',
-    density: undefined
-  }]
-};
-
-var iconDensityValueTests = [null, {},
-  [], false, '', -0, '-0', -1.0000, -123131132, -1.2e+200,
-  'Infinity', '-Infinity',
-  '-1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
-  '1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
-];
-
-iconDensityValueTests.forEach((density) => {
-  var expected = `Expect density to default to 1.0.`;
-  testIcon.icons[0].density = density;
-  data.jsonText = JSON.stringify(testIcon);
-  var result = processor.process(data);
-  is(result.icons[0].density, 1.0, expected);
-});
-
-testIcon = {
-  icons: [{
-    src: 'test',
-    density: undefined
-  }]
-};
-
-var parseFloatTests = [3.14, '3.14', `${whiteSpace}3.14${whiteSpace}`, 12e300];
-parseFloatTests.forEach((testNumber) => {
-  var expected = `Expect density to be ${parseFloat(testNumber)}.`;
-  testIcon.icons[0].density = testNumber;
-  data.jsonText = JSON.stringify(testIcon);
-  var result = processor.process(data);
-  is(result.icons[0].density, parseFloat(testNumber), expected);
-});
-  </script>
-</head>
diff --git a/dom/manifest/test/test_ImageObjectProcessor_src.html b/dom/manifest/test/test_ImageObjectProcessor_src.html
index 76ccaa0d500d..cb77af0bddc0 100644
--- a/dom/manifest/test/test_ImageObjectProcessor_src.html
+++ b/dom/manifest/test/test_ImageObjectProcessor_src.html
@@ -22,14 +22,11 @@ var noSrc = {
     src: {}
   }, {
     src: null
-  }, {
-    density: '1'
   }, {
     type: 'image/jpg'
   }, {
     sizes: '1x1,2x2'
   }, {
-    density: '1',
     sizes: 'any',
     type: 'image/jpg'
   }]
@@ -77,7 +74,6 @@ var withSrc = {
     src: 'pass'
   }, {
     src: 'pass',
-    density: 1
   }, {}, {
     foo: 'foo'
   }]
