Update: the purge/reinstall does only fix the problem temporarily.
A few minutes ago I tried to visit a website which uses flash: no flash, the site gives me a link for downloading flash. After doing purge/reinstall as described above and restarting firefox the site works.
In both situations I don't see any difference in about:plugins.
I don't visit flash sites regularly (on the contrary, I really try to avoid them), so in the meantime my computer has seem some changes/updates etc. firefox is still the same.
Update: the purge/reinstall does only fix the problem temporarily.
A few minutes ago I tried to visit a website which uses flash: no flash, the site gives me a link for downloading flash. After doing purge/reinstall as described above and restarting firefox the site works.
In both situations I don't see any difference in about:plugins.
I don't visit flash sites regularly (on the contrary, I really try to avoid them), so in the meantime my computer has seem some changes/updates etc. firefox is still the same.
Oliver