diff --git a/browser/base/content/tabbrowser.xml b/browser/base/content/tabbrowser.xml
index e6bf0c62cff7..e58b17b9d1b3 100644
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -2069,7 +2069,7 @@
         "audioPlaybackStopped", "pauseMedia", "stopMedia",
         "blockMedia", "resumeMedia", "mute", "unmute", "blockedPopups", "lastURI",
         "purgeSessionHistory", "stopScroll", "startScroll",
-        "userTypedValue", "userTypedClear", "mediaBlocked"
+        "userTypedValue", "userTypedClear"
       ]</field>
 
       <method name="_createLazyBrowser">
@@ -2122,8 +2122,6 @@
                   break;
                 case "reload":
                 case "reloadWithFlags":
-                case "blockMedia":
-                case "resumeMedia":
                   getter = () => {
                     return (params) => {
                       // Wait for load handler to be instantiated before
@@ -2137,7 +2135,6 @@
                   break;
                 case "userTypedValue":
                 case "userTypedClear":
-                case "mediaBlocked":
                   getter = () => {
                     return SessionStore.getLazyTabValue(aTab, name);
                   };
diff --git a/browser/components/sessionstore/SessionStore.jsm b/browser/components/sessionstore/SessionStore.jsm
index d91eda4db7a9..073e2127d300 100644
--- a/browser/components/sessionstore/SessionStore.jsm
+++ b/browser/components/sessionstore/SessionStore.jsm
@@ -3588,8 +3588,6 @@ var SessionStoreInternal = {
       tab.toggleMuteAudio(tabData.muteReason);
     }
 
-    tab.setMediaBlock(!!tabData.mediaBlocked);
-
     if (tabData.lastAccessed) {
       tab.updateLastAccessed(tabData.lastAccessed);
     }
diff --git a/browser/components/sessionstore/TabAttributes.jsm b/browser/components/sessionstore/TabAttributes.jsm
index b1bf9fb07f44..105641ee7aa6 100644
--- a/browser/components/sessionstore/TabAttributes.jsm
+++ b/browser/components/sessionstore/TabAttributes.jsm
@@ -14,10 +14,8 @@ this.EXPORTED_SYMBOLS = ["TabAttributes"];
 // 'pending' is used internal by sessionstore and managed accordingly.
 // 'iconLoadingPrincipal' is same as 'image' that it should be handled by
 //                        using the gBrowser.getIcon()/setIcon() methods.
-// 'mediaBlocked' should not be accessed directly but handled by using the
-//                tab.linkedBrowser.mediaBlocked, setMediaBlock methods.
 const ATTRIBUTES_TO_SKIP = new Set(["image", "muted", "pending", "iconLoadingPrincipal",
-                                    "skipbackgroundnotify", "mediaBlocked"]);
+                                    "skipbackgroundnotify"]);
 
 // A set of tab attributes to persist. We will read a given list of tab
 // attributes when collecting tab data and will re-set those attributes when
diff --git a/browser/components/sessionstore/TabState.jsm b/browser/components/sessionstore/TabState.jsm
index 3a0de4503991..8c21b1f0d03c 100644
--- a/browser/components/sessionstore/TabState.jsm
+++ b/browser/components/sessionstore/TabState.jsm
@@ -102,8 +102,6 @@ var TabStateInternal = {
       tabData.muteReason = tab.muteReason;
     }
 
-    tabData.mediaBlocked = browser.mediaBlocked;
-
     // Save tab attributes.
     tabData.attributes = TabAttributes.get(tab);
 
diff --git a/browser/components/sessionstore/test/browser_attributes.js b/browser/components/sessionstore/test/browser_attributes.js
index 949c5a53d058..1619ed090017 100644
--- a/browser/components/sessionstore/test/browser_attributes.js
+++ b/browser/components/sessionstore/test/browser_attributes.js
@@ -25,21 +25,15 @@ add_task(async function test() {
   // Check that the tab has a 'muted' attribute.
   ok(tab.hasAttribute("muted"), "tab.muted exists");
 
-  tab.setMediaBlock(true /* block */);
-  // Check that the tab has a 'media-blocked' attribute.
-  ok(tab.hasAttribute("media-blocked"), "tab.media-blocked exists");
-
   // Make sure we do not persist 'image' or 'muted' attributes.
   ss.persistTabAttribute("image");
   ss.persistTabAttribute("muted");
   ss.persistTabAttribute("iconLoadingPrincipal");
-  ss.persistTabAttribute("mediaBlocked");
   let {attributes} = JSON.parse(ss.getTabState(tab));
   ok(!("image" in attributes), "'image' attribute not saved");
   ok(!("iconLoadingPrincipal" in attributes), "'iconLoadingPrincipal' attribute not saved");
   ok(!("muted" in attributes), "'muted' attribute not saved");
   ok(!("custom" in attributes), "'custom' attribute not saved");
-  ok(!("mediaBlocked" in attributes), "'mediaBlocked' attribute not saved");
 
   // Test persisting a custom attribute.
   tab.setAttribute("custom", "foobar");