I used to use Adobe flash, but noticed on Google it's no longer supported
FF suggest using "shockwave flash" but can't seem to find it, any idea's / suggestions please?
Flash is broadly speaking not supported or used in many places, with possibly the only exception being sites that failed to update before Flash was closed. This is the final message from the team behind Flash https://www.adobe.com/uk/products/flashplayer/end-of-life.html
If you do have a site that needs it, it is something that the site administrators will need to look into mitigating.