Verify it works for your OS and Firefox version.

''<p>Kanhaiya Rana [[#question-1501373|said]]</p>'' <blockquote>installation aborted because the add-on appears to be corrupt. </blockquote> Is see you are using a Firefox 115 version on Linux. Do you have Firefox 115.13.0esr or later? The "appears to be corrupt" message is something you would get if you are not using Firefox 115.13.0esr or later like the current 115.21.0esr or Firefox 128 or later as explained in this KB article https://support.mozilla.org/en-US/kb/root-certificate-expiration