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You have downloaded and installed Java, which is needed for Online Product Key activation in Sentinel EMS Customer Portal. Now you have to make sure it is enabled in your web browser. If you are using Mozilla Firefox, follow the instructions below.  

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1. Select which browser installation(s) on your computer should use the latest Java version you installed. For this, open the Start menu, then open All Programs (on Windows 7) or All apps (on Windows 10). 

2. Find Java (either Java (32-bit) or Java (64-bit)). Click on it in order to open the Java Control Panel.

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3. Open the Advanced tab. Scroll to the Default Java for browsers section, and make certain that each checkbox is checked.

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4. Go to the Security tab. In the Exception Site List section, add the addresses of your Customer Portal (the Edit Site List button):

• with http protocol used;
• with https protocol used;
• with http protocol and port number used;
• with https protocol and port number used.
  

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5. Enable Java in Firefox's Add-ons Manager. To do that:

5.1. Click Tools in the Menu Bar at the top of a Firefox window, and click Add-ons from the drop-down menu.

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If your menu is hidden, click the Image Added button and then choose Add-ons.

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The Add-ons Manager will open in a new tab or window.

5.2. Click Plugins. In the list, find Java(TM) Platform SE. If you see Java (disabled), it means that Java content will not display in Firefox. To enable Java, click the Never Activate pull-down menu.

5.3.

• If you want to ask you to activate Java each time you encounter Java content, select Ask to Activate.
• If you want Java to be activated when it's required without your permission, select Always Activate
  

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Your selection will be saved automatically.

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6. Reload the Firefox.