When you see a 'blocked plugin' error message on a black screen when a screensaver starts, this means a plug-in — a third-party program required by the screensaver — is not working. In 99% of the cases, the plug-in in question is the Adobe Flash Player, and the solution is to update Flash to the latest version, as Apple blocks outdated versions for security reasons.
It is also possible you have never installed the required plug-in on your computer. Whatever the case is, this help page will guide you through the actions required to fix the problem.
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- At this point, the updated Adobe Flash version is installed on your Mac and you can now browse Flash websites and use Flash-based Mac plug-ins without problems. One final tip: To get the most out of your Mac and make sure it is in excellent condition at all times, we.
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Because the 'blocked plugin' message can be hidden by some screensavers, the solution provided here may also apply to Mac screensavers that stop working but show no errors.
Checking for updates
Follow these steps to check for updates to the Adobe Flash Player. Alternatively, you can re-install the plug-in using the instructions below '(Re-)installing the Adobe Flash Player'.
- Click the Apple icon in the top left of your screen
- Click 'System Preferences'
- Check for a 'Flash Player' link in the bottom row of the System Preferences panel
- If a 'Flash Player' link is shown, click it and continue with the next step. If not, skip ahead to the '(Re-)installing Adobe Flash Player' section below
- The 'Flash Player' panel will open. Click the 'Updates' tab
- Click the 'Check Now' button to check for available updates
- If an update is available, you will be notified and forwarded to the Adobe website
- Follow the instructions on the Adobe website to install the Flash Player update
If no updates are available, you can try clearing 'all local storage, saved choices, settings and other data used by content in Flash Player' from the 'Advanced' tab of the Flash Player panel. Note that this will reset the settings of other applications that rely on Flash.
(Re-)installing the Adobe Flash Player
To install the Adobe Flash Player plug-in for the first time, or to update it to the latest version without checking for updates first, follow these steps:
- Go to https://get.adobe.com/flashplayer/otherversions/
- Beneath 'Step 1', select 'Mac OS X'
- Beneath 'Step 2', select 'FP X Mac for Safari and Firefox - NPAPI (where X is a number)
- Click the 'Download now' button to begin downloading the plug-in
- Once your download is complete, open the file that was downloaded to show its contents in the Finder, then double-click 'Install Adobe Flash Player.app'
- Follow the instructions of the installer to complete the installation process
You now have the latest version of the Adobe Flash Player plug-in. The next time your screensaver starts, you should no longer see the 'blocked plugin' error message.
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Safari extensions add functionality to Safari, so you can explore the web the way you want. Extensions can show helpful information about a webpage, display news headlines, help you use your favorite services, change the appearance of webpages, and much more. Extensions are a great way to personalize your browsing experience.
Use the App Store to conveniently download and install Safari extensions. All extensions in the App Store are reviewed, signed, and hosted by Apple for your security.
How to install extensions
Start by installing the latest macOS updates to make sure that Safari is up to date. You need Safari 12 or later to get Safari extensions from the App Store.
Find and install an extension:
- Open Safari and choose Safari > Safari Extensions from the menu bar.
- The App Store opens to the Safari Extensions page, as pictured above. To download and install an extension, click Get or click the price. You might be asked to sign in with your Apple ID.
- Click Install.
- After the extension is installed, click Open and follow the onscreen instructions provided by the extension.
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Then return to Safari to turn on the extension you installed:
- Choose Safari > Preferences.
- Click Extensions.
- Select the checkbox next to the extension's name.
All extensions installed from the App Store are automatically kept up to date.
How to turn off or uninstall extensions
Choose Safari > Preferences, then click Extensions.
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- To turn off an extension, deselect its checkbox.
- To uninstall an extension, select the extension and click the Uninstall button. If you can't determine what an extension does, or you don't expect to use it again, you should uninstall it.
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Safari no longer supports most web plug-ins. To load webpages more quickly, save energy, and strengthen security, Safari is optimized for content that uses the HTML5 web standard, which doesn't require a plug-in. To enhance and customize your browsing experience, use Safari extensions instead of web plug-ins.