Day 36 – Mime Type For Firefox Extension Auto Install On Download

My current favorite way to share my Kynetx apps is through Amazon’s S3. For Firefox to auto detect a Firefox extension and start the installation process, special Mime type headers need to be set. This can now be easily done with S3 through the AWS console or through a capable FTP client like cyberduck.

AWS console

log into console and find extension file

Right click on file

Set content-type to application/x-xpinstall


Find file in cyberduck

Right click and select info or be cool and use the keyboard shortcut ‘cmd + i’

Set content-type to application/x-xpinstall in Metadata tab


For Google Chrome extensions, check out the documentation at

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