Internet Explorer: Flash Player is installed as ActiveX® plug-in. Installing Flash Player in Internet Explorer doesn't install Flash Player on other browsers, such as Mozilla Firefox, Opera, and Netscape.
Mozilla Firefox / Opera / Netscape: Flash Player is installed as a plug-in. Installing Flash Player in any of these browsers automatically installs Flash Player in other browsers too. For example, if you install Flash Player in Mozilla Firefox, Flash Player gets automatically installed in Netscape if Netscape is present in your machine.
For installing Flash Player in a browser, using the browser, go to Adobe site. Download Flash Player and double-click the downloaded file to install Flash Player.
Google Chrome: Flash Player is integrated with Google Chrome. You don't need to install it separately.