diff --git a/toolkit/components/pictureinpicture/content/player.js b/toolkit/components/pictureinpicture/content/player.js
index 5c6c9b1ca0e3..4b4bd0f65eb7 100644
--- a/toolkit/components/pictureinpicture/content/player.js
+++ b/toolkit/components/pictureinpicture/content/player.js
@@ -65,7 +65,6 @@ let Player = {
   WINDOW_EVENTS: [
     "click",
     "contextmenu",
-    "dblclick",
     "keydown",
     "mouseout",
     "resize",
@@ -172,11 +171,6 @@ let Player = {
         break;
       }
 
-      case "dblclick": {
-        this.onDblClick(event);
-        break;
-      }
-
       case "keydown": {
         if (event.keyCode == KeyEvent.DOM_VK_TAB) {
           this.controls.setAttribute("keying", true);
@@ -185,10 +179,6 @@ let Player = {
           this.controls.hasAttribute("keying")
         ) {
           this.controls.removeAttribute("keying");
-
-          // We preventDefault to avoid exiting fullscreen if we happen
-          // to be in it.
-          event.preventDefault();
         } else if (
           Services.prefs.getBoolPref(KEYBOARD_CONTROLS_ENABLED_PREF, false) &&
           !this.controls.hasAttribute("keying") &&
@@ -225,17 +215,6 @@ let Player = {
     }
   },
 
-  onDblClick(event) {
-    if (event.target.id == "controls") {
-      if (document.fullscreenElement == document.body) {
-        document.exitFullscreen();
-      } else {
-        document.body.requestFullscreen();
-      }
-      event.preventDefault();
-    }
-  },
-
   onClick(event) {
     switch (event.target.id) {
       case "audio": {
diff --git a/toolkit/components/pictureinpicture/tests/browser.ini b/toolkit/components/pictureinpicture/tests/browser.ini
index 750f2dd59fc0..7f88cf4a227d 100644
--- a/toolkit/components/pictureinpicture/tests/browser.ini
+++ b/toolkit/components/pictureinpicture/tests/browser.ini
@@ -23,7 +23,6 @@ prefs =
 [browser_contextMenu.js]
 [browser_closePlayer.js]
 [browser_closeTab.js]
-[browser_dblclickFullscreen.js]
 [browser_disabledForMediaStreamVideos.js]
 [browser_fullscreen.js]
 skip-if = (os == "mac" && debug) #Bug 1566173
diff --git a/toolkit/components/pictureinpicture/tests/browser_dblclickFullscreen.js b/toolkit/components/pictureinpicture/tests/browser_dblclickFullscreen.js
deleted file mode 100644
index 60053da21acc..000000000000
--- a/toolkit/components/pictureinpicture/tests/browser_dblclickFullscreen.js
+++ /dev/null
@@ -1,124 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-
-"use strict";
-
-/**
- * Tests that double-clicking on the Picture-in-Picture player window
- * causes it to fullscreen, and that pressing Escape allows us to exit
- * fullscreen.
- */
-add_task(async () => {
-  await BrowserTestUtils.withNewTab(
-    {
-      gBrowser,
-      url: TEST_PAGE,
-    },
-    async browser => {
-      let pipWin = await triggerPictureInPicture(browser, "no-controls");
-
-      let entered = BrowserTestUtils.waitForEvent(
-        pipWin,
-        "MozDOMFullscreen:Entered"
-      );
-
-      let controls = pipWin.document.getElementById("controls");
-
-      EventUtils.sendMouseEvent(
-        {
-          type: "dblclick",
-        },
-        controls,
-        pipWin
-      );
-
-      await entered;
-
-      Assert.equal(
-        pipWin.document.fullscreenElement,
-        pipWin.document.body,
-        "Double-click caused us to enter fullscreen."
-      );
-
-      await BrowserTestUtils.waitForCondition(() => {
-        return !TelemetryStopwatch.running("FULLSCREEN_CHANGE_MS");
-      });
-
-      // First, we'll test exiting fullscreen by double-clicking again
-      // on the document body.
-
-      let exited = BrowserTestUtils.waitForEvent(
-        pipWin,
-        "MozDOMFullscreen:Exited"
-      );
-
-      EventUtils.sendMouseEvent(
-        {
-          type: "dblclick",
-        },
-        controls,
-        pipWin
-      );
-
-      await exited;
-
-      Assert.ok(
-        !pipWin.document.fullscreenElement,
-        "Double-click caused us to exit fullscreen."
-      );
-
-      await BrowserTestUtils.waitForCondition(() => {
-        return !TelemetryStopwatch.running("FULLSCREEN_CHANGE_MS");
-      });
-
-      // Now we double-click to re-enter fullscreen.
-
-      entered = BrowserTestUtils.waitForEvent(
-        pipWin,
-        "MozDOMFullscreen:Entered"
-      );
-
-      EventUtils.sendMouseEvent(
-        {
-          type: "dblclick",
-        },
-        controls,
-        pipWin
-      );
-
-      await entered;
-
-      Assert.equal(
-        pipWin.document.fullscreenElement,
-        pipWin.document.body,
-        "Double-click caused us to re-enter fullscreen."
-      );
-
-      await BrowserTestUtils.waitForCondition(() => {
-        return !TelemetryStopwatch.running("FULLSCREEN_CHANGE_MS");
-      });
-
-      // Finally, we check that hitting Escape lets the user leave
-      // fullscreen.
-
-      exited = BrowserTestUtils.waitForEvent(pipWin, "MozDOMFullscreen:Exited");
-
-      EventUtils.synthesizeKey("KEY_Escape", {}, pipWin);
-
-      await exited;
-
-      Assert.ok(
-        !pipWin.document.fullscreenElement,
-        "Pressing Escape caused us to exit fullscreen."
-      );
-
-      await BrowserTestUtils.waitForCondition(() => {
-        return !TelemetryStopwatch.running("FULLSCREEN_CHANGE_MS");
-      });
-
-      let pipClosed = BrowserTestUtils.domWindowClosed(pipWin);
-      pipWin.close();
-      await pipClosed;
-    }
-  );
-});