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Can't download .crt files

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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.

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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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0

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cor-el
  • Top 10 Contributor
  • Moderator
17525 solutions 158458 answers

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 ?

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 ?
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Question owner

"Save link as" in my university's specific context always tried to save an .html file.

"Save link as" in my university's specific context always tried to save an .html file.
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