You need to use a program such as Winrar etc. to unpack the 7z file. The 7z file is a compressed file that contains the required .xpi file.

G. Thomas Durham wrote:
That still doesn't explain how to install the file in Thunderbird.
Thunderbird asks for a .xpi file.

On Jul 3, 12:24 am, Webmail Author <[email protected]> wrote:
WinRar, 7-zip, Zip can access a 7z file


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