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How do I install a Theme download in Firefox 4 -Windows XPproSP3

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  • 5 have this problem
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  • Last reply by cor-el

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I have downloaded a Theme ( utopia_ffse_white-4.0.5-fx.jar) to my desktop and have been unable to find out how to install it. Never had any problems over the years with any other versions of Firefox or Themes, and this it the latest version FF4 release. I checked the Mozilla (Programs folder) and found no folders containing any (.jar) files, and would appreciate any help available. Thank you. Doug

I have downloaded a Theme ( utopia_ffse_white-4.0.5-fx.jar) to my desktop and have been unable to find out how to install it. Never had any problems over the years with any other versions of Firefox or Themes, and this it the latest version FF4 release. I checked the Mozilla (Programs folder) and found no folders containing any (.jar) files, and would appreciate any help available. Thank you. Doug

Chosen solution

Easiest to install themes is directly from the website.


Open the Theme Manager (Firefox/Tools > Add-ons > Appearance) and then drag the theme_name.jar file in the left pane of the Theme Manager window.
You need to restart Firefox twice for a theme:

  1. After the download to install the theme so you see it in the Add-ons Manager.
  2. To use the theme by selecting it in Themes Manager.

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All Replies (3)

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Chosen Solution

Easiest to install themes is directly from the website.


Open the Theme Manager (Firefox/Tools > Add-ons > Appearance) and then drag the theme_name.jar file in the left pane of the Theme Manager window.
You need to restart Firefox twice for a theme:

  1. After the download to install the theme so you see it in the Add-ons Manager.
  2. To use the theme by selecting it in Themes Manager.

Modified by cor-el

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Thank you very much for such a rapid and concise reply. Most impressed with the thoroughness and additional link. Thanks again snapshooter87.

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You're welcome