You can drag the installer into the theme-window (”Tools” –> “Add-ons”).
There you can activate or deactivate the theme.

Click on this link Install Firefox Theme From Local Disk
to install from the local disk.
Related Links:

All about technology
You can drag the installer into the theme-window (”Tools” –> “Add-ons”).
There you can activate or deactivate the theme.

Click on this link Install Firefox Theme From Local Disk
to install from the local disk.
Related Links:

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