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.

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

  1. Update the Flash Plug-in
  2. Update Firefox
  3. Check the Flash Plug-in is enabled
  4. Allow Flash on Trusted Sites
  5. Disable the This plug-in is vulnerable and should be updated Error Message
  6. Use UR Browser to avoid errors

1. Update the Flash Plug-in

The error message suggests that a plug-in needs updating. So it might be the case that you need to update Flash. This is how you can update Adobe Flash for Firefox.

  1. First, open this website page to check if you need to install or update Flash. The page will tell if you Flash isn’t installed and if you need to update it.
  2. To update Flash, open this website page; and deselect the optional offers checkboxes if you don’t need the extra software.
  3. Press the Install Now button to save the Flash installer.
  4. Once you’ve saved the Flash installer to a folder, close Firefox.
  5. Then open the Adobe Installer below, and press the Next button to update the plug-in.

update flash player preferences

2. Update Firefox

If you’re not using the most update Firefox version, you should also update the browser.

  1. Click the Open menu button at the top right of Firefox, and select Open Help Menu to expand a Help menu.
  2. Next, select About Firefox to open the window below.firefox about
  3. Firefox will now check for updates. If there are any, you can press a Restart Firefox to Update button.


3. Check the Flash Plug-in is enabled

  1. Another thing to check is that Flash is on and active. To do that, press the Open menu and click Add-ons to open the tab directly below.
  2. 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.

4. 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.

5. Disable the This plug-in is vulnerable and should be updated Error Message

Another way that you can ensure the plug-in error message never displays in Firefox is to disable it.

  1. You can do that by entering ‘about:config’ in the Firefox URL bar to open the page below.
  2. Next, enter ‘extensions.blocklist.enabled’ in the search box.
  3. Now double-click extensions.blocklist.enabled to switch it to false.extensions.blocklist.enabled firefox flags settings
  4. Restart the Firefox browser. The plug-in error message will no longer appear in Firefox.

6. Use UR Browser to avoid errors

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

ur browser promo

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. It has 3 levels of privacy modes you can assign for every website individually and avoid tracking and profiling. The built-in VPN will ensure your true IP address is always hidden and virus scanner that the files you downloaded are not malicious.

Check it out and see for yourself how an excellent browser can change the way you roam the interwebz for the better.

Editor's recommendation
ur browser
  • Fast page loading
  • VPN-level privacy
  • Enhanced security
  • Built-in virus scanner

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.


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

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