Over the past couple of weeks, a handful of major security holes have been found in Adobe Flash. This is the browser add-on which allows you to play videos on web sites. Or at least it used to be. Nowadays, most sites (including Youtube) have switched to HTML5 to handle video, so the number of sites which require Flash is not as great as it used to be.
To highlight just how serious a problem these Flash problems are, the latest version of Firefox, which also shipped in the last week or so, now blocks all Flash videos by default. Try to play a web-based video in Firefox and, if the video requires the Flash player, your video simply won't play.
So there are a couple of things that you need to be aware of, to ensure that your enjoyment of your PC continues while your security also remains intact. Firstly, if you use Firefox and it's set to auto-update, don't be surprised if video-heavy sites start to break. Or if video ads on sites don't play properly. You can change the setting in Firefox if you want, to re-enable Flash, but this is unwise unless you understand the risks. Much better to wean yourself off Flash, and hope that the rest of the industry does too.
Secondly, if you have Flash player installed on your PC, it's a good idea to remove it. You can do this from the control panel.
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