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Icegger-it Aseqdac Firefox 12352034
sɣur Aseqdac Firefox 12352034, 5 jierren lyn
I get the message -
This add-on cannot be installed as it appears to be corrupt, after the add-on is downloaded.
Please fix it ASAP

Tiririt n ineflayen

yeffeɣ-d deg 5 jierren lyn
There are a couple of things that can cause this. You could try https://discourse.mozilla.org/c/add-ons/add-on-support/ to troubleshoot over the forum.