The power of the intertubes in action! Some wonderful soul named PÃ¥l Kristiansen found a solution to my Firefox problem!
Found a solution that worked for me:
1. delete the file located at
/Users//Library/Application Support/Firefox/pluginreg.dat
2. Restart Firefox.
…as I said, it worked for me :
And low and behold: no more flash problem! Thank you so much PÃ¥l.