Please consider adding this version, recommended by Adobe themselves for increased stability. The latest Flash player/plugin (especially the Firefox/Pale Moon plugin) keeps crashing quite often and this is a nice way to minimize such problems. It is available here (https://www.adobe.com/products/flashplayer/distribution3.html), scroll down the page (Extended Support Release). It has a different update cycle than the latest standard version (currently v16).
For anyone who wants to try it, make sure to completely uninstall (https://forums.adobe.com/thread/928315) your currently installed Flash plugin first.
Also note that currently Patch My PC reports an installed Adobe Flash ESR version as outdated (which is wrong, since it's a different release) and updates to the latest v.16 (which is not wanted).