Mac safari flash not working
Scroll down and click on Advanced to expand it.
Enable for Safari
Scroll down to Flash and then toggle the control so that it says Ask First recommended. To do this, open Safari and then click on Safari at the top and click on Preferences. Click on the Websites tab and there should be a section called Plug-ins at the bottom of the left panel.
Make sure that Adobe Flash Player is checked. Some people have reported that videos will work properly upon clearing cache. Make sure to check Cached images and files and then click the Clear Data button. A lot of Flash content requires Javascript, so if you have an extension that is blocking Javascript from running, you will need to disable it. You can also try disabling the popup blocker for the particular site you are having issues on. While on the screen of the blank YouTube video that is not working correctly, right-click the area where the video would normally show up to bring up the Flash Player context menu.
How to Re-Enable Flash in Safari 10
Select the Settings option from the menu. Unselect the option Enable hardware acceleration and click the Close button. If you are not seeing the right-click content menu, simply visit this Adobe help page and right-click on the Flash logo. Close out of the browser completely, relaunch and test the Flash content again to see if it plays.
YouTube now supports HTML 5 fully and as long as you are running a fairly recent version of your browser, all the features should be fully supported too. If something is not checked here, that means your browser is very old and needs to be updated.
Hopefully, this post will help you to troubleshoot blank video players and non-working Flash apps in OS X. Clear your Cookies, Cache, and History.
Fix Black or Blank Screen and Flash Videos Not Playing
Click Safari on the menu bar at the top of your screen and then Preferences. Select the Privacy tab. Click checkbox for Allow from websites I visit. Click Details or Manage Website Data Type Pandora in the search box.
Click Remove All and then click Done. Restart the browser and go back to www.
Install the latest version of the Flash player using the appropriate link for your operating system: If you have an older Mac with the PowerPC processor, the highest version you can run is If you have the latest Flash version installed, ensure that Flash is enabled to run on your browser: Ensure that Enable JavaScript is selected.
Also, in this Security tab, make sure to bypass your Pop-up Blocker for Pandora.
Stay in Touch
Under Web content , check every option except 'Block pop-up windows. Your changes should take place after reloading the Pandora page in your browser. If you have the AdBlock extension, click the AdBlock icon on your tool bar and select "Don't run on this domain.