These add-ons are not for Firefox but for the Thunderbird mail
client.  To install them in Thunderbird a simple way is to:

save the add-ons to your desktop.

Open Thunderbird > Tools > Add-ons

Drag the Webmail icons from the desktop onto the add-ons window

On Aug 24, 10:54 am, DMC081 <[email protected]> wrote:
> which firefox web browser version does it work for?

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