Adobe Flash Player can be used for accessing web cameras and microphones connected to your computer, store cookies, supercookies and data on your computer's hard drive, and even upload content to other users. Therefore it is important to set Adobe Flash Player settings to safest possible - you probably know how often critical security bugs are found in the Flash Player.
Adobe Flash Player is already built into Internet Explorer 10 and 11 in Windows 8 and 8.1.
Google Chrome has a special "pepper" version of Flash Player and its settings can be changed only at this Macromedia web page. Despite looking a bit different, its settings are pretty much the same as described in this tutorial.
First, please make sure you are running the latest version of Adobe Flash Player by visiting Browser and Plug-in Check page. This is your first step to more secure configuration!
To add a free protection layer from even unpatched security bugs, please read the Microsoft EMET article!
In Windows XP, Vista and 7, click Control Panel on the right side of Start menu.
In Windows 8 and 8.1, use keyboard shortcut Windows Key+W to open Settings Search. Type "flash" into Search box and click Flash.
In Windows Vista and 7, it is best to type "flash" into Control Panel Search box to quickly locate the Adobe Flash Player applet. You can also use Category View to locate it.
Then click Flash Player or Flash Player (32-bit).
In Windows XP, you must switch Control Panel to Classic View first. Do this by clicking the Switch to Classic View link on the left. Then locate and double-click Flash Player.
Flash Player Settings Manager opens in Storage tab. This is the tab related to Flash cookies that many companies (mis)use for tracking users' behavior online. While not all Flash cookies are sneaky, it is best to keep these away. Do this by clicking Block all sites from storing information on this computer.
Please note that this might affect a few online games or video sites - game progresses are not saved or videos do not play (YouTube and other major video sites are not affected by the setting).
A warning window about deleting all stored cookies appears. Click OK.
You might have to repeat this step if this is the first time you're configuring Flash Player.
Removing all stored Flash cookies
If you want to erase all Flash cookies later or you did not see the warning message, click the Delete All... button on Storage tab.
Delete All Site Data in Flash Player window opens with the first option, Delete All Site Data and Settings, selected by default.
If you are selling or recycling your current computer, it is recommended to select the Delete All Audio and Video License Files option, too.
Click Delete Data to erase all stored Flash cookies.
Click Camera and Mic tab above.
To prevent unauthorized access to your webcam and microphone, use the default option - Ask me when a site wants to use the camera or microphone (recommended). This will pop up a prompt each time a web site tries to see or hear you.
In case you need to be extra private, use the Block all sites from using the camera and microphone option instead.
Click Playback tab. The name is quite misleading, it configures peer-assisted networking instead.
Some internet connections have very limited upload bandwith, so it is not advisable to share it with other users who visit the same web site. If your upload bandwith is full or nearly full, it will also strongly affect download speed (web pages open very slowly).
To prevent slowdowns, click Block all sites from using peer-assisted networking.
Click Advanced tab.
The first button, Delete All... removes all stored Flash cookies and files, plus resets settings to their (sometimes insecure) defaults. You should use this only if you're recycling or selling your PC.
In Updates section, select Install updates automatically when available (recommended). This setting is available since version 11.2 of Adobe Flash Player, and it downloads updates in the background. Installing the updates is offered only after you log off / sign out of your Windows account and then log back in (this also includes restarting your PC).
Please note that current version numbers are also displayed here, both for ActiveX (Internet Explorer) and Plug-In (all other Internet browsers, except for Google Chrome).
To check for updates right away, click Check Now.
You can use free Secunia PSI for fully automated updates of Flash Player.
If you want to sell or recycle your computer, you should deauthorize the computer first. This removes all licenses for purchased or rented content, such as audio and video files.
To do this, scroll the page down and click Deauthorize This Computer...:
Deauthorize This Computer window appears. Close all open Internet browsers and click OK to erase all licenses.
And that's it - Adobe Flash Player configuration is now safer.