Firefox 22, SeaMonkey 2.19 and below: Click the 'Disable' button to disable the Flash plugin.Select 'Always Activate' to enable the plugin. If the Flash plugin is disabled, click the 'Enable' button to enable the plugin. Note: On Windows, the Flash plugin is detected via plugin scanning. If you have installed the Flash plugin but it does not appear in the Add-ons Manager, open about:config and make sure that the preference has not been set to 'false' (if it has, right-click on it and select Reset to set it back to 'true'). To see if the Flash plugin is working and what version is being used, visit one of these pages: Note: If the Flash plugin is installed, make sure it is enabled in the Firefox (3.0 and above) or SeaMonkey 2 Add-ons Manager ( see above) otherwise, the Flash test will not work and the 'Shockwave Flash' plugin entry will not be displayed in the about:plugins list.

If Flash is not installed, this may trigger the Plug-in Finder Service, which you can use to download and install the Flash plugin on Windows ( see below).

Firefox flash plugin safe