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I'm trying to use a CMS (ceasy) from Firefox on Ubuntu and running into problems when I try to cut/copy/paste into a rich text editor field there. A window pops up informing me that this is due to the site's use of a signed app and telling me to change the following configuration: In about:config, set signed.applets.codebase_principal_support to true. However, doing so does not change anything.

I'm asking this question here because this works fine in FF(Windows) and seems to be a more specific problem of Firefox on Ubuntu.

Any ideas?

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