This plugin is vulnerable and should be updated

Matthew Adams
by Matthew Adams
Windows & Software Expert
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  • Many users report getting the Firefox plug-in error This plug-in is vulnerable and should be updated.
  • Updating the Flash Plug-in could help fix the error, so make sure to continue reading the article.
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  • We recommend that you take a closer look on our Firefox hub, for more in-depth solutions.
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Microsoft, Google, and Mozilla have all been abandoning NPAPI plug-ins in their browsers.

Thus, plug-ins are increasingly becoming history on the web. Adobe Flash is one notable exception as Google Chrome and Firefox still actively support that plug-in. Consequently, plug-in related error messages are also becoming rarer.

However, This plug-in is vulnerable and should be updated is a plug-in error message that might still appear on some pages open in the Firefox browser.

As you can see, dealing with these types of plug-in related errors can be frustrating, so we compiled a list of steps that can help you fix the issue. 

This plug-in is vulnerable and should be updated [FIX]

  1. Use Opera
  2. Update the Flash Plug-in
  3. Update Firefox
  4. Check the Flash Plug-in is enabled
  5. Allow Flash on Trusted Sites
  6. Disable the extensions
  7. Use UR Browser to avoid errors

1. Use Opera

Opera browser

If you’re inclined towards a seamless browsing experience without anything to bother you, consider switching to Opera. The moment you start using it, we’re sure you’ll know to appreciate what it has to offer.

This privacy-oriented browser is, just like all the iterations of Chrome, built on the open-source Chromium platform with a lot of nifty built-in additions.

Once you install Opera, the built-in VPN will ensure that your IP address is hidden and all the files you download will be virus-free.

Another great thing about Opera is that it comes with various built-in packages, enhanced resource consumption, and great design.

As for solving the plug-in error all you need to do is enable the Flash Player.

Opera’s video pop-out functionality has enhanced users’ experience. If let’s say you want to continue browsing but don’t want to close the video, it will simply remain on the ground while you access other sites.



Opera is an excellent web browser that offers free VPN and fast ad blocker with high customizations available.

2. Update the Flash Plug-in

  1. Open the Flash Player website page.
  2. Check if you need to install or update Flash.
  3. Go to the Flash Player download page.
  4. Deselect the optional offers checkboxes.
  5. Press the Install Now button.
  6. Save the Flash installer.
  7. Open the Adobe Installer.
  8. Press the Next button to update the plug-in.

update flash player preferences

3. Update Firefox

  1. Click the Open menu button at the top right of Firefox.
  2. Select Open Help Menu.
  3. Select About Firefox.firefox about
  4. Firefox will now check for updates.
  5. Press Restart Firefox to Update button.

4. Check the Flash Plug-in is enabled

  1. Press the Open menu.
  2. Click Add-ons to open the tab directly below.
  3. Next, click Plug-ins on the left of the tab.

shockwave player firefoxIf Shockwave Flash is configured to Never Activate, click its drop-down menu and select Ask to Activate. Then the browser asks permission to activate Flash.

5. Allow Flash on Trusted Sites

If you’re still getting the This plug-in is vulnerable and should be updated error on pages, click the Activate Adobe Flash link just below it.

Then a pop-up menu opens at the top left of the browser with two options to select from.

Press the Allow and Remember button there to activate Flash on the website page every time you open it. Selecting Allow now will activate the plug-in only the one time, but blocks it again the next time you visit the site.

6. Disable the extensions

  1. Enter about:config in the Firefox URL bar.
  2. Next, enter extensions.blocklist.enabled in the search box.
  3. Double-click extensions.blocklist.enabled.
  4. Switch it to false.extensions.blocklist.enabled firefox flags settings
  5. Restart Firefox browser.

Mozilla Firefox, like all other major browsers, removed third-party flash players as extensions so they’re not a necessity in order to play the Flash and video content anymore.

They switched to a built-in flash player, while still supporting Adobe Flash Player until 2020.

That’s about it. If you follow all the steps indicated above you should have no problem solving the plug-in error. Let us know in the comments section below which one worked for you.

Editor’s Note: This post was originally published in August 2017 and has been since revamped and updated in July 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in August 2017 and was revamped and updated in August 2020 for freshness, accuracy, and comprehensiveness.