![]() Back up all data before making any changes. For a "missing plug-in" error, start with Step 8. After each step, relaunch Safari and test. If you have installed the latest version of Flash, please take each of the following steps that you haven't already tried. If you can't install or update Flash, follow these instructions. Or, yes, try resetting Flash Player using its preferences, check whether you have a flash blocker extension already installed and see if that is failing or otherwise needs an upgrade - then - if all that fails - removing and reinstalling it, as dominic23 suggests. ![]() But the attacks can spread pretty quickly, which means a Flash Blocker is usually recommended. Apple blocks Adobe Flash Player shortly after there are reports of security breaches involving Flash Player, and requires an upgrade to Flash Player. Flash Player has been popular with attackers seeking to breach OS X security. Īdobe Flash Player has had a very long history of some very nasty security vulnerabilities. H.264 format video has native decoding support on OS X, which means your MacBook Air stays cooler, and your battery lasts longer. Most YouTube videos are available in H.264. ![]() That extension switches YouTube Flash video over to H.264 video - a switch which will work fine for the vast majority of videos over there. Alternatively, install the Safari YouTube5 extension, and remove Adobe Flash Player entirely. ![]()
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