When I try to add a theme to my Mozilla Firefox, Java says "invalid or corrupt jarfile", what is that?
First, I go to Mozilla's website, then I click on "Add-ons" and then I go to "themes". When I choose my theme, I click on "continue to download", which leads to a page with the User-license agreement, I click "accept and download", it starts to download, but then a pop-up from Java says "Invalid or corrupt file". Can you tell me what that means? And how do I fix it?
First, I go to Mozilla's website, then I click on "Add-ons" and then I go to "themes". When I choose my theme, I click on "continue to download", which leads to a page with the User-license agreement, I click "accept and download", it starts to download, but then a pop-up from Java says "Invalid or corrupt file". Can you tell me what that means? And how do I fix it?
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You can't install a theme that way. If you do not want to install the them directly from the Add-ons website then drag the .jar file in the left pane of the Theme Manager (Tools > Add-ons > Themes) to install the theme. If you double-click the downloaded themes .jar file then you get that error, so do not do that.
See also http://kb.mozillazine.org/Themes