diff --git a/browser/base/content/browser-context.inc b/browser/base/content/browser-context.inc
index cd7b2ede3ae7..7d2e5befd6d6 100644
--- a/browser/base/content/browser-context.inc
+++ b/browser/base/content/browser-context.inc
@@ -382,7 +382,7 @@
                 label="&viewPageSourceCmd.label;"
                 accesskey="&viewPageSourceCmd.accesskey;"
                 oncommand="BrowserViewSource(gContextMenu.browser);"
-                observes="canViewSource"/>
+                observes="isImage"/>
       <menuitem id="context-viewinfo"
                 label="&viewPageInfoCmd.label;"
                 accesskey="&viewPageInfoCmd.accesskey;"
diff --git a/browser/base/content/browser-sets.inc b/browser/base/content/browser-sets.inc
index f26808bce81f..f074a8123858 100644
--- a/browser/base/content/browser-sets.inc
+++ b/browser/base/content/browser-sets.inc
@@ -39,7 +39,7 @@
 
     <commandset id="editMenuCommands"/>
 
-    <command id="View:PageSource" oncommand="BrowserViewSource(window.gBrowser.selectedBrowser);" observes="canViewSource"/>
+    <command id="View:PageSource" oncommand="BrowserViewSource(window.gBrowser.selectedBrowser);" observes="isImage"/>
     <command id="View:PageInfo" oncommand="BrowserPageInfo();"/>
     <command id="View:FullScreen" oncommand="BrowserFullScreen();"/>
     <command id="View:ReaderView" oncommand="ReaderParent.toggleReaderMode(event);"/>
@@ -174,7 +174,6 @@
                  oncommand="gPopupBlockerObserver.dontShowMessage();"/>
     <broadcaster id="blockedPopupsSeparator"/>
     <broadcaster id="isImage"/>
-    <broadcaster id="canViewSource"/>
     <broadcaster id="isFrameImage"/>
     <broadcaster id="singleFeedMenuitemState" disabled="true"/>
     <broadcaster id="multipleFeedsMenuState" hidden="true"/>
@@ -232,9 +231,7 @@
     <broadcaster id="devtoolsMenuBroadcaster_PageSource"
                  label="&pageSourceCmd.label;"
                  key="key_viewSource"
-                 command="View:PageSource">
-      <observes element="canViewSource" attribute="disabled"/>
-    </broadcaster>
+                 command="View:PageSource"/>
     <broadcaster id="devtoolsMenuBroadcaster_ErrorConsole"
                  label="&errorConsoleCmd.label;"
                  command="Tools:ErrorConsole"/>
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 93340060b9c6..4998dce4573f 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -4049,10 +4049,6 @@ var XULBrowserWindow = {
     delete this.isImage;
     return this.isImage = document.getElementById("isImage");
   },
-  get canViewSource () {
-    delete this.canViewSource;
-    return this.canViewSource = document.getElementById("canViewSource");
-  },
 
   init: function () {
     // Initialize the security button's state and tooltip text.
@@ -4210,7 +4206,6 @@ var XULBrowserWindow = {
       if (aRequest) {
         let msg = "";
         let location;
-        let canViewSource = true;
         // Get the URI either from a channel or a pseudo-object
         if (aRequest instanceof nsIChannel || "URI" in aRequest) {
           location = aRequest.URI;
@@ -4219,9 +4214,6 @@ var XULBrowserWindow = {
           if (location.scheme == "keyword" && aWebProgress.isTopLevel)
             gBrowser.userTypedValue = null;
 
-          canViewSource = !Services.prefs.getBoolPref("view_source.tab") ||
-                          location.scheme != "view-source";
-
           if (location.spec != "about:blank") {
             switch (aStatus) {
               case Components.results.NS_ERROR_NET_TIMEOUT:
@@ -4235,18 +4227,10 @@ var XULBrowserWindow = {
         this.setDefaultStatus(msg);
 
         // Disable menu entries for images, enable otherwise
-        if (browser.documentContentType && BrowserUtils.mimeTypeIsTextBased(browser.documentContentType)) {
+        if (browser.documentContentType && BrowserUtils.mimeTypeIsTextBased(browser.documentContentType))
           this.isImage.removeAttribute('disabled');
-        } else {
-          canViewSource = false;
+        else
           this.isImage.setAttribute('disabled', 'true');
-        }
-
-        if (canViewSource) {
-          this.canViewSource.removeAttribute('disabled');
-        } else {
-          this.canViewSource.setAttribute('disabled', 'true');
-        }
       }
 
       this.isBusy = false;
diff --git a/browser/base/content/test/general/browser.ini b/browser/base/content/test/general/browser.ini
index 0556e28261fd..a192bbb08ab5 100644
--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -475,7 +475,6 @@ skip-if = os == "linux" || e10s # Bug 1073339 - Investigate autocomplete test un
 [browser_urlbar_search_healthreport.js]
 [browser_urlbar_searchsettings.js]
 [browser_utilityOverlay.js]
-[browser_viewSourceInTabOnViewSource.js]
 [browser_visibleFindSelection.js]
 [browser_visibleLabel.js]
 [browser_visibleTabs.js]
diff --git a/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js b/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js
deleted file mode 100644
index 4aec2a64e2f3..000000000000
--- a/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js
+++ /dev/null
@@ -1,31 +0,0 @@
-add_task(function*() {
-  yield new Promise((resolve) => {
-    SpecialPowers.pushPrefEnv({"set": [
-                                ["view_source.tab", true],
-                              ]}, resolve);
-  });
-});
-
-add_task(function* test_regular_page() {
-  function* test_expect_view_source_enabled(browser) {
-    ok(!XULBrowserWindow.canViewSource.hasAttribute("disabled"),
-       "View Source should be enabled");
-  }
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "http://example.com",
-  }, test_expect_view_source_enabled);
-});
-
-add_task(function* test_view_source_page() {
-  function* test_expect_view_source_disabled(browser) {
-    ok(XULBrowserWindow.canViewSource.hasAttribute("disabled"),
-       "View Source should be disabled");
-  }
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "view-source:http://example.com",
-  }, test_expect_view_source_disabled);
-});