Another is that Firefox's settings file storing plugin data has become corrupted. One possible reason for an installed plugin not to appear on the Add-ons page is if Firefox has been set NOT to scan the registry for plugins. (I'm going to assume that entry still exists.) If you have the correct physical file in the usual location, but Firefox does not discover it or has lost track of it:įirefox discovers the location of the Flash plugin from an entry its installer creates in the Windows Registry. If you do not have that file: The installer isn't working for some reason. In 64-bit Firefox on 64-bit Windows 10 that should be here:Īnd the file would be named NPSWF64_32_0_0_363.dll (unless there is a newer version with something different instead of 363). If the Flash plugin is not listed on the Add-ons page:Ĭheck for the Plugin DLL in the Usual Location In the old days when Flash was more common, we had numerous threads about why Firefox might not detect or enable Flash, so I'll paste from one of those: (B) At startup, Firefox finds Flash listed in the Windows Registry and adds it to the Plugins list on the Add-ons page (the other two you usually find there are OpenH264 and Widevine) (A) Install Flash player for Firefox using a download from Adobe's site - the installer lists Shockwave Flash as an available plugin in the Windows Registry

Firefox flash plugin corrupted