YouTube Fullscreen Not Working Problem on Safari, Chrome, Firefox Solutions

You may experience browser doesn't support YouTube fullscreen problem. Here are tips to fix YouTube fullscreen not working problems in Safari, Chrome, Firefox, etc.

Jul 30,2019 • Filed to: YouTube Downloader and Converter • Proven solutions

YouTube fans might often encounter the YouTube fullscreen not working problem. There might be problems of YouTube fullscreen on Google Chrome, and there will be no luck even you click the fullscreen button. If you are looking for ways to fix the issue of "Your browser doesn't support fullscreen", here is the right place for you. In this article, you can find some ways to solve the YouTube fullscreen problem on Safari, Chrome, Firefox and other browsers.

Part 1. Fix YouTube Fullscreen Problem on Safari, Chrome and Firefox

#1: YouTube Fullscreen Not Working in Chrome

If your favorite browser is Chrome but it reaches a point and disappoints you by failing to go to full screen mode when you are using YouTube, it could be a problem with the flash version that you have installed on your computer. To fix YouTube fullscreen not working on Chrome issue, you will need to check your flash version and make sure that it is the latest.

This problem could also be caused the Chrome's built-in flash player. To resolve the issue in this case, you will need to open Chrome, and then go to "About" in the Menu bar, and then choose "Plugins". In the dialog box that will come up, you will need to look for Chrome's built-in player (flashplugin.iso) and then disable it. Disabling this flash player allows the browser to use the latest flash version that you have installed on your computer.

your browser doesn't support full screen

#2: YouTube Fullscreen Not Working on Safari

You can also experience the YouTube fullscreen not working when you are using Safari. This problem mostly occurs when you are using the HTML5 version player and not the classic player version. There are a number of ways that you can use to fix this issue. One is by using the following process. You will need to enable the flash plugin in Safari by doing the following:

  • Open Safari, and then go to Preferences.
  • After that you will need to choose Security, and then tick "enable plugins".

You will also need to make sure that HTML5 is disabled. Additionally, you need to make sure that you have the latest version of flash player on your computer.

Another way that you can use to fix YouTube fullscreen not working in Safari, is by clearing website data and emptying cache. If you attempt to play the YouTube videos and they do not seem to show any improvement when in full screen mode, you will need to uninstall Safari from your computer, and then do its clean reinstallation. If there were any bugs in the browser, they will be fixed after completing the reinstallation.

youtube fullscreen not working safari

#3: YouTube Fullscreen Glitch on Firefox

If you are trying to watch your favorite videos in Firefox and then you run into the fullscreen YouTube problem, it is usually because of a bug in the version of Firefox that you are using. It mostly occurs when you exit out of a fullscreen video on YouTube after Firefox has just performed an update. There are a number of ways that you can use to fix this issue. One is by running system restore as follows.

  • On your computer, go to the Windows or Start button, and then type System Restore in the search bar.
  • When the System Restore dialog box opens, follow the prompts until you finally restore your system to an earlier time before the update.

You can also fix this problem by disabling flash hardware acceleration using the following procedure.

  • Go to the Adobe Flash Player page, and then hold down the Control key on your keyboard while clicking on the flash player logo.
  • And then click on Settings on the context menu to open the Adobe Flash Player settings screen.
  • On the bottom left corner of the window, click on the icon to open the display panel.
  • Look for "Enable hardware acceleration" and then remove the checkmark.

browser doesn't support full screen

Part 2. YouTube Fullscreen Problem Solution in One Click

The high recommended way to solve YouTube fullscreen not working is to download YouTube videos for offline playback. And you can use iTube HD Video Downloader Best YouTube Downloader to download any YouTube videos for free. This YouTube downloader allows you to download any YouTube videos, including YouTube 4K UHD and YouTube VEVO in 1 click. And you can have a "Playlist" button to download the whole YouTube playlist, channel and category. What's more, you can directly play the YouTube videos in fullscreen with its built-in media player.

iTube HD Video Downloader - Download and Play YouTube without Fullscreen Problem

  • 1 click download videos from YouTube and 10,000 more other sites with Safari, Chrome or Firefox plugin.
  • Support download YouTube to MP3 and batch download multiple YouTube videos at one time.
  • Directly download storage media files from a sharing link of Google Drive, Dropbox, One Drive, etc.
  • Convert videos to any desired video and audio format, or presets for popular mobile devices.
  • Record any online video from any online video sites even those unable to download sites.
  • Directly transfer downloaded music or videos to iTunes library or mobile devices.
  • Offer a Private Mode to fully protect your downloading information with a password known by yourself only.

Part 3. Solutions to YouTube Full Screen Problem with HTML5 Player

When you are watching YouTube videos using the YouTube HTML5 player, you might not get any response when you click the fullscreen button sometimes. You are likely to get this error if you have blocked fullscreen mode on YouTube, or if some flash add-ons have been disabled. To resolve YouTube Fullscreen problem with HTML5 player, you will need to try the following.

  • Go to "about: permissions", and then entering
  • If the error persists, go to "about:config", and then search for "full-screen-api.approval-required"
  • You will need to change it to "false".

Another way that you can use to fix this issue is by checking the add-ons to make sure that those that are related to YouTube HTML5 player are enabled. You may need to restart your browser for the changes to take effect just in case you do some edits.

The issue could also be because of a bug that will need a full re-installation of your browser, so you should consider doing that if the error persists.

youtube fullscreen glitch

Part 4. YouTube App Doesn't Support Full Screen? Solved!

This is one of the frequent problems that you are likely to get when you are playing YouTube videos. It is likely to be a problem with your browser's setting or flash player settings on your computer. To fix it, you will need to do the following.

  • Right click on the YouTube video that is experiencing this problem.
  • Under the far-left tab among the tabs that are found at the bottom of the video, look for a box with "Enable hardware acceleration", and then disable or uncheck it.

You might get an error message stating that you cannot change hardware acceleration. If that happens, you will need to do the following.

  • Go to into your display/graphics properties by right clicking on the desktop.
  • And then lower your resolution or color quality. If it was 32 bit initially, you can try lowering it to 16 bit and then see if that will resolve the issue.

In case you are using internet explorer and you get this error, you will need to go to "Manage add ons" in Tools, and then make sure that flash is enabled. You might also need to update the internet explorer that you are using to the latest version just in case the version you have is older.

Steven Wilson

staff Editor

0 Comment(s)
> Resources > YouTube Downloader and Converter > YouTube Fullscreen Not Working Problem on Safari, Chrome, Firefox Solutions

All Topics