If you need to disable or block a Safari plug-in
If you installed a plug-in and notice that Safari runs more slowly, quits unexpectedly, won’t download files, or has other problems, the plug-in may be the problem.
Quickly disable a plug-in
You can quickly disable or enable a plug-in. This is an easy way to check if the plug-in is causing problems.
Choose Safari > Preferences, then click Websites.
Do one of the following:
Disable a plug-in: Deselect the checkbox to the left of the plug-in name.
Enable a plug-in: Select the checkbox to the left of the plug-in name. For common plug-ins such as Adobe Flash Player, you also need to turn on the plug-in for each website.
Set plug-in blocking policies for websites
You can allow the plug-in for some websites and block it for others.
Choose Safari > Preferences, then click Websites.
On the left, select the plug-in you want to disable.
For each website, click the pop-up menu on the right, then choose Off.
For some plug-ins, you see pop-up menus for different websites, and you can choose to block each one individually. To block all other websites that don’t have individual settings, click the “When visiting other websites” pop-up menu, then choose Off.
If the problem is fixed, contact the developer of the plug-in to see if there’s a newer version.