How To Install The Adobe Flash Plugin In Firefox (Snap Package)?

Solution 1:

Pretty simple, Mark Johnson had it correct but he deleted. The way I always install flash is to go here - https://get.adobe.com/flashplayer/otherversions/

In the drop downs choose linux & the .tar.gz for for NPAPI. Extract the download, copy libflashplayer.so to ~/snap/firefox/common/.mozilla/plugins folder, creating that plugins folder as it won't exist.

That's it. One can go to the about:plugins URL to see if it is up-to-date. If it complains that it's out-of-date (or a website you visit complains that it's out-of-date), just follow the same procedure to update it