Alice Wonder wrote: > > Thank you, that looks like what I originally was seeking - a way to > blacklist the plugin. > > It's still a bit puzzling that there isn't a checkbox next to plugins in > the Preferences pane. In 'about:addons -> Plugins', there is a pull down next to each plugin that has 'Ask to Activate', 'Always Activate' and 'Never Activate' I believe the default is 'Ask to Activate' - so setting this to 'Never Activate' will effectively disable the plugin The 'lockPref' example in an autoconfig file forces 'Never Activate' without letting users change this setting > I gather FireFox is planning to get rid of plugin support altogether so > soon it may not be an issue. I believe the next ESR release (ESR 52 in March 2017) will still support NPAPI plugins - although the mainline Firefox releases after that date won't (see https://blog.mozilla.org/futurereleases/2016/07/20/reducing-adobe-flash-usage-in-firefox/) - so, I guess NPAPI plugin support will still exist in Firefox shipped by RedHat/CentOS until sometime in 2018 James Pearson