How to Resolve: Plugin Container for Firefox has stopped Working

How to Resolve: Plugin Container for Firefox has stopped Working

Here we can see, “How to Resolve: Plugin Container for Firefox has stopped Working”

With or around version 3.6.4 of Firefox, Plugin Container (executable file) became a Plugin Handler responsible for handling plugins. This was added to Firefox to prevent plugin crashes.

To avoid a crash, all Firefox plugins are loaded into the Plugin Container. The fixes in this tutorial will also address:

When using Full-Screen mode on Firefox, Plugin Container stops working.

When using Firefox in VMware, the Plugin Container no longer works.

Solution 1: Update Flash Player 

Shockwave (Flash) Player is a difficult component, yet you need it to browse the web. This is one of the main reasons why the plugin stops working in Firefox.

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Problems like this can arise when previous versions of Shockwave run on dubious sites, as malicious people can leverage security weaknesses in old versions to damage your machine. Here’s how to update your Mozilla browser’s plugin.

  1. There is no automated way to update plugins using the browser, as you will be taken to this site when you start Mozilla Firefox and go to Tools >> Add-ons >> Plugins and click the Update Now option.
  2. Open the link above. You should see your Windows architecture (32bit or 64bit), desired language, and browser on the left side of the screen.
  3. Downloading the player from another browser or computer (possible if Firefox is slow): Click on “Need Flash Player for another computer?” and select your operating system and browser (Firefox).
  4. Then click the Download Now button. Disable the optional offers in the middle of the browser window that install McAfee programmes.
  5. Run the file from your Downloads folder, wait for the installation files to download entirely, and follow the on-screen directions to install Flash Player. After that, restart your computer and see whether the error persists.

Note: It’s conceivable that the installation won’t go as planned due to user issues. That’s when you need to perform a clean install using Adobe’s Uninstaller tool.

  1. Click on the above link to begin downloading the Uninstaller utility to your computer (the Download will start as soon as you click on the link). Download any apps or programmes that use Shockwave Flash (instant messengers, browsers, games, etc.).
  2. Run the uninstaller file from your Downloads folder and follow the on-screen directions to uninstall Flash Player.
  3. After uninstalling, clean up by going to the directories listed below and deleting any files or folders you find there. To navigate, press Windows + R to open the Run dialogue box and paste in the paths below:


%appdata%\Adobe\Flash Player

%appdata%\Macromedia\Flash Player

4. Repeat steps 1-3 above after restarting your computer.

Solution 2: Broken Xmarks Add-on 

Xmarks is a popular bookmark management utility for the Mozilla Firefox browser. When a plugin fails, the plugin-container crashes, displaying the error. The Xmarks plugin has ceased operating in Plugin Container for Firefox.

  1. Double-click the Mozilla Firefox icon on the Desktop or search for it in the Start menu.
  2. Find the blue Xmarks symbol in the window’s top right. Click it and select Xmarks Settings.
  3. If Xmarks isn’t operating, go to Add-ons and open the options. Click on the menu button in the top right corner of the browser and select Add-Ons. You may also type “about:addons” in the Mozilla browser’s URL bar.
  4. Locate the Xmarks add-on and select Options.
  5. Navigate to the Advanced tab on the Xmarks Settings window and select Repair. Follow the on-screen directions and restart your browser. Check if the issue is resolved.

Solution 3: Update Firefox

Updates are available to solve problems and correct bugs, as intended. Several individuals online reported that updating their Firefox version quickly resolved the issue, so you should try this.

Although Firefox’s auto-update feature is normally enabled, you can still do the process manually if you stop it due to annoyance.

  1. Then double-click the desktop icon, or search for it in the Start menu and select the first result.
  2. To learn more about Firefox, click the menu button in the upper right corner of the browser window.
  3. When the About Mozilla Firefox box opens, the browser checks for updates and downloads them if any are available. After the Download is complete, click the Restart to update Firefox option.
  4. Check if the same issue occurs when Firefox is restarted.
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Solution 4: Unprotected Flash Mode in Adobe Flash

This solution is intended for users of 32-bit machines, as this feature is not available in 64-bit browsers. Protected mode is meant to keep you safe from intruders and harmful assaults, but even Mozilla admits that it might cause frequent crashes and errors like this one. That’s why you can disable it and see if it helps.

  1. A slightly more difficult but not overly complex technique is available for 64-bit Windows users.
  2. Double-click the Mozilla Firefox icon on the Desktop or search for it in the Start menu.
  3. Click on the menu button in the top right corner of the browser and select Add-Ons.
  4. Locate and select the Plugins option in the right pane of the screen to see the entire list of installed plugins. Click Options next to Shockwave Flash and uncheck “Enable Adobe Flash protected mode”.
  5. Restart your browser to see if the issue is resolved.

64-bit Windows users:

1. Try browsing to this place from My Computer or This PC in File Explorer:


2. If you can’t see any of the directories in the process, it’s because your system has hidden files disabled.

3. Select the “Hidden items” checkbox in the Show/hide section of File Explorer’s “View” tab. File Explorer will now show hidden files until you alter them again.

4. Look for mms.cfg. Edit it by right-clicking it. You will need administrative rights to do so. When prompted, choose New >> Text File from the Flash folder. Save the file as “mms.cfg” and select All types.

5. In any case, edit the mms.cfg file and add the following line at the end:


6. Save and exit Notepad. This update will occur when the Flash plugin has been disabled, so close Firefox and wait a few minutes.

Solution 5: Remove Hardware Acceleration

While hardware acceleration can occasionally increase browser performance, it has also caused several errors and problems that users could have avoided by simply disabling it. It’s simple to do in Firefox, but you should also disable it in Flash’s settings.


  1. Click the menu button in the top right corner of the browser and select Options. Go to the General panel.
  2. To reach the “Use hardware acceleration when possible” entry, scroll down to the Performance section and uncheck the box. Close the menu and clear the check box next to it. Restart your browser and see if the error persists.


  1. A Flash animation on their official Help page disables it quickly. Please scroll down to the tree animation, and Right-click it and select Settings.
  2. In the settings dialogue window, which should open, stay in the first Display tab of the settings window and clear the box next to the “Enable hardware acceleration” option before clicking the close button and restarting your browser.

User Questions:

What is Firefox Plugin Container?

Plugins are run separately from ordinary browser code in the plugin-container. Flash is by far the most popular. Because some websites rely on Flash for communication, they may request microphone authorization.

How can I get Firefox to work again?

  1. Hardware acceleration should be turned off.
  2. Smooth Scrolling is disabled.
  3. Extensions such as AdBlocker should be disabled.
  4. Remove all cookies from your computer.
  5. Proxy settings should be removed.
  6. Set a minimum level of protection.
  7. Firefox should be reinstalled.
  8. Windows 10 should be cleaned up and reinstalled.
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How do I turn off the plugin-container?

  1. Open Firefox and put about:config into the address bar. I swear I’ll be careful.
  2. Now, in the Filter box, look for ipc.
  3. As seen above, double-click on each of the five items one by one to set their values to ‘false.’ dom.ipc.plugins.enabled.
  4. Restart the Mozilla Firefox browser. That concludes our discussion.

What causes Firefox to stop operating all of a sudden?

If Firefox used to work but now refuses to start, it could be due to faulty data in your preferences. Because your settings are not erased when you uninstall Firefox, reinstalling it will not solve the problem. Create a new profile in the Profile Manager to determine whether this is the problem.

Where did Firefox containers go?

Containers are now available as a Firefox Extension, making it available to everyone who uses Firefox. In addition to their privacy benefits, Containers allow users to log in to many accounts at once without having to use multiple browsers or repeatedly sign in and out.