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Showing content from https://support.mozilla.org/en-US/kb/using-flash-plugin-firefox below:

Flash Plugin - Keep it up to date and troubleshoot problems

This article is no longer maintained, so its content might be out of date.

End of Flash support:

Like other browsers and Adobe, Firefox ended Flash support at the end of 2020. Please see

End of support for Adobe Flash

for more information.

The Adobe Flash Player browser plugin lets you view video and animated content in Firefox. This article has information about testing, installing, updating, uninstalling and troubleshooting the Adobe Flash plugin.

The Firefox Software Update feature does not update installed plugins. See the

Adobe Security bulletins and advisories page

for information about security and stability issues affecting Adobe Flash Player and other Adobe products.

Testing Flash

Visit Adobe's Flash Player Help page to see if the Flash plugin is installed and working properly. If it tells you that Flash is not installed, see the next section on how to install the latest Flash plugin.

Installing or updating Flash

The Flash plugin automatically updates itself by default. If Adobe's Flash Player Help page says that Flash is outdated and you don't want to wait for the automatic update, you can update Flash manually by downloading and installing the latest version from Adobe.

To check if your installation of Flash is up to date, visit Adobe's Flash Player Help page. If it says that Flash is outdated, you can update Flash by downloading and installing the latest version from Adobe.

Go to Adobe's Flash Player download page and download the Flash installer.
Caution: Adobe's download page may include a checkbox for optional software (such as Google Chrome or McAfee Security Scan) that is selected by default. If you do not clear the checkbox before downloading, that software will be installed on your computer when you open the Flash installer.
When the download has finished, close Firefox. Click the Firefox menu and select .Click the Firefox menu at the top of the screen and select .Click the Firefox menu and select .
Open the Flash installer file you downloaded and follow the instructions.

Note:

If you are having problems with the Flash installer from Adobe's download page, you can use

this Flash Player installer link

to directly download the full installer.

Go to Adobe's Flash Player download page.
When prompted, save the file (i.e. install_flash_player_"version"_linux."processor".tar.gz).
Click the Firefox menu and select .Click the Firefox menu at the top of the screen and select .Click the Firefox menu and select .
Open a Terminal window (in Gnome, click on the menu, select , and then select .)
In the Terminal window, change to the directory where you saved the file you downloaded (e.g. cd /home/user/Downloads).
Extract libflashplayer.so from the file you downloaded with the command tar -zxvf install_flash_player_"version"_linux."processor".tar.gz.
As the super user, copy the extracted file, libflashplayer.so, to your Firefox installation directory's plugins sub-directory. For example, if Firefox is installed in /usr/lib/mozilla, use the command sudo cp libflashplayer.so /usr/lib/mozilla/plugins and then enter your super user password when prompted.

Note

: Running Adobe's uninstaller will remove Flash from all browsers where it is not built-in

, including Internet Explorer

. You will be prompted to reinstall Flash when you visit a page that requires it, such as

Adobe's Flash Player Help page

Troubleshooting Flash plugin not working

If Adobe's Flash Player Help page does not show that Flash is working even though you have installed the latest version, your Flash plugin may be disabled in the Add-ons Manager. To make sure that Flash is enabled,

Click the menu button , click and select .

If Flash is disabled, click the ellipsis (3-dot) icon and select in the drop-down menu.

Flash plugin not working on certain websites

Firefox can block the Flash plugin on certain websites, if using it would cause security, speed or stability problems. For more information, see The Flash plugin is blocked on some sites by default.

Flash works in Internet Explorer or Chrome but not in Firefox

There are three different types of Flash Players: an ActiveX version for Internet Explorer, a Chrome version built into the browser and a plugin version for Firefox and some other browsers. If you want Flash to work in Firefox you must install the plugin version, as explained above.

"Run Adobe Flash" prompts

The Flash plugin is set to "Ask to Activate" by default. Click on the "Run Adobe Flash" message to allow the Flash content to load (if it doesn't, reload the webpage and try again). For details, see the Why do I have to click to activate plugins? article.

The Adobe Flash plugin has crashed

If you see this message instead of Flash content, see Adobe Flash plugin has crashed - Prevent it from happening again and Adobe Flash protected mode in Firefox.

Cannot view full screen Flash videos

See Flash videos won't play full screen.

Playing Flash videos makes Firefox hang

If Firefox stops responding or if the Flash plugin hangs or stops working when playing Flash videos or games, try these solutions:

Pause or stop Flash in other tabs. You may need to close those tabs.
Update Flash. See the Installing or updating Flash section above for instructions.
Disable hardware acceleration in Flash settings. See Disable hardware acceleration in Flash for details.
Update your graphics drivers. See Upgrade your graphics drivers to use hardware acceleration and WebGL.