The "Mozilla Firefox Version 52.x ESR" is the last Version, which supported NPAPI Plugins, like the VLC-Webplugin. Plugin Roadmap Firefox: https://developer.mozilla.org/en-US/docs/Plugins/Roadmap In my Windows 10 (64-Bit) I could successfull install the Firefox 52.9 ESR (64-Bit) and the VL...