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Now select False in the boolean value box and click on OK button.

Type plugin.load_flash_only in the preference name box and click on OK button.Ĥ. Now right-click anywhere in the preferences list and select “ New -> Boolean” option.ģ. It’ll launch Firefox’s hidden advanced configuration page.Ģ. It’ll show you a warning message, click on “ I accept the risk!” button. Open Mozilla Firefox and type about:config in the addressbar and press Enter. We’ll need to use Firefox advanced configuration tool “ about:config” to re-enable support for NPAPI plugins as shown in following steps:ġ. If you also want to bring back support for all NPAPI plugins in Mozilla Firefox 52 or later versions, this tutorial will help you. The good news is that if some users want to enable support for all NPAPI plugins back in Firefox browser, Mozilla has provided a preference to turn on the support in the meantime. Mozilla decided to disable supports for all NPAPI plugins except Adobe Flash as according to the company, these plugins are the main reason behind browser crashes and other performance and security related issues.

Only support for Adobe Flash Player plugin is enabled as its still widely used by websites. In the recently released Mozilla Firefox 52 version, Mozilla has disabled support for NPAPI (Netscape Plugin Application Programming Interface) plugins such as Microsoft Silverlight, Java, Unity, Acrobat, Shockwave, DivX, etc.