Adobe Flash Player is a plugin that allows browsers such as Firefox to display Flash media on web pages. Flash is often used for animations, videos and games. This article explains how to install Flash.

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• Find the preference dom.ipc.plugins.sandbox-level.flash and double-click it click the Edit button. Enter an integer value of 0 (zero) and click OK on the checkmark to save the change. Quit and reopen Firefox so that the change will take effect.
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When you visit a webpage that uses Flash and the plugin is missing, you will see the message 'A plugin is needed to display this content' for parts of the page that require Flash (if at all):

Follow the steps below to install the latest Flash Player plugin.

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1. 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.
2. When the download has finished, close Firefox. Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
3. Open the Flash installer file you downloaded and follow the instructions.

1. Go to Adobe's Flash Player download page and download the Flash installer.
2. Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
3. Open the file you downloaded (i.e. install_flash_player_osx_intel.dmg).
4. In the Finder, open the Install Adobe Flash Player.app to run the installer, then follow the installer's instructions.

1. Go to Adobe's Flash Player download page.
2. When prompted, save the file (i.e. install_flash_player_'version'_linux.'processor'.tar.gz).
3. Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
4. Open a Terminal window (in Gnome, click on the Applications menu, select Accessories, and then select Terminal.)
5. In the Terminal window, change to the directory where you saved the file you downloaded (e.g. cd /home/user/Downloads).
6. Extract libflashplayer.so from the file you downloaded with the command tar -zxvf install_flash_player_'version'_linux.'processor'.tar.gz.
7. 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.
   

The latest version of the Flash plugin should perform better and crash less often. To check if Flash is up to date, visit Adobe's Flash Player Help page. If it says that Flash needs to be updated, install the latest version manually using the steps in the section above.

See Flash Plugin - Keep it up to date and troubleshoot problems for steps to troubleshoot the Flash plugin.

This article explains how to download and install Firefox on a Mac.

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• If you are updating from a previous version of Firefox, see Update Firefox to the latest release.

1. Visit the Firefox download page in any browser (for example, Safari). It will automatically detect the platform and language on your computer and recommend the best version of Firefox for you.
2. Click .
   • Note: If you want to have a choice of the language for your Firefox installation, click the Download options and other languages link instead.
3. Once the download has completed, the file (Firefox.dmg) may open by itself and pop open a Finder window containing the Firefox application. Drag the Firefox icon on top of the Applications folder in order to copy it there.

   Note: If you do not see this window, open the Firefox.dmg file that you downloaded.

4. After dragging Firefox to the Applications folder, hold down the control key while clicking in the window and select Eject 'Firefox' from the menu.

Tip: You can add Firefox to your dock for easy access. Just open your Applications folder and drag Firefox to the dock.

Firefox is now ready for use. Just click on its icon in the dock or Applications folder to start it.

When you first start up Firefox, you will be warned that you downloaded Firefox from the Internet. Because you download Firefox from the official site, click .

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Upon installation, Firefox will not be your default browser, which you'll be notified about. That means that when you open a link in your mail application, an Internet shortcut, or HTML document, it will not open in Firefox. If you want Firefox to do those things, click . If you're just trying out Firefox or simply do not wish to set Firefox as your default browser, click .