In order to switch to another persona that you had previously installed, do the following:

1. Go to Tools and click Add-ons (or click the Firefox button at the top left and click Add-ons).
2. Switch to the Appearance tab. You should find your previously used personas in the list.
3. Find the one you want to use and click the Enable button.

To uninstall the other ones you can click the Remove button on them and they'll be uninstalled instantly.

Sorry, but that does not solve the problem. The Theme was ok until I installed the Adobe Flash update, then the "theme" reverted back to the gray. I have deleted the theme and reinstalled it, but Firefox will not use it. Very frustrating. Got another suggestion? I appreciate it.

Make sure that you do not run Firefox in (permanent) Private Browsing mode.

• https://support.mozilla.org/kb/Private+Browsing

• Firefox > Preferences > Privacy > Firefox will: "Use custom settings for history"
• Deselect: [ ] "Always use private browsing mode"

That filename for the installer looks a bit strange. When I updated my Flash plugin, the filename for the installer was install_flash_player_11_osx.dmg. Was yours some kind of special player?