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I am not able to install or update any extension in firefox or firefox developer edition

  • 2 replies
  • 1 has this problem
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  • Last reply by cor-el

Mohammed Alhendi
Mohammed Alhendi
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I try to install some extension but there some issue I don't know about it. I try to reinstall firefox developer again this issue not solved and refreshed it and not solved. and finally install normal firefox with new profile and this issue still not solved.

I can only install extension file if I download it directly form download library and convert the file from .xpi to .zip and install it manually in add ons manager.

please let me know how to solve this error.

I try to install some extension but there some issue I don't know about it. I try to reinstall firefox developer again this issue not solved and refreshed it and not solved. and finally install normal firefox with new profile and this issue still not solved. I can only install extension file if I download it directly form download library and convert the file from .xpi to .zip and install it manually in add ons manager. please let me know how to solve this error.
Attached screenshots

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user104147805413306348376805769878442569366
user104147805413306348376805769878442569366
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Hi Mohammed Alhendi, If you are using ESET please see this thread -

ALL extensions appear to be corrupt. https://support.mozilla.org/en-US/questions/1381931

cor-el
cor-el
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The System Details shows: 

SecuritySoftware:
 registeredAntiVirus: ESET Security
 registeredAntiSpyware: 
 registeredFirewall: ESET Firewall