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Behavior:
A new stable version of the popular Firefox browser was released today. This is the first version of the browser which has support for classic NPAPI plugins disabled.

Solution:
In Firefox 52, the user can turn on NPAPI plugin support using about:config.
Here is how it can be done.

  1. Open a new tab in Firefox and enter the following text in the address bar: about:config
    Confirm that you will be careful if a warning message appears for you.
  2. Create a new boolean option and name it  'plugin.load_flash_only.'
  3. Set the plugin.load_flash_only option to 'false'.
  4. Restart Firefox.

Other links:
Google Chrome V42 disables Silverlight : KBA-35408

This article is valid for DocuWare versions: 6 6.1 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 7 | Silverlight Firefox Web deactivated Configuration #FAQID_4896