Can't download .crt files
When using Linux to connect to networks, sometimes I need to download a certificate, so I can use it when trying to connect to that network. Firefox absolutely refuses to download .crt files. Firefox will only ever give me the message "this certificate is already installed". I had to download Opera so I could download the certificate so I could connect to my university's network. I can't change what Firefox does with .crt files in Preferences>General>Applications because it doesn't try to download it, and I don't have the option to add something.
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If you get "this certificate is already installed" then Firefox tries to install the certificate in the Certificate Manager. This error usually means that you already have a certificate with this name installed.
Did you try "Save Link As" in the right-click context menu instead to save the certificate ?
"Save link as" in my university's specific context always tried to save an .html file.