Addon failure

Could you explain the reason I am getting the message “could not be installed because it appears to be corrupt”

I have tried several addons and get the same message

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I assume this problem is in Firefox 106 or in Firefox 102esr.

This could occur if the download failed. Try right-clicking the blue Add to Firefox button and using Save Link As. Can Firefox download the file that way or do you get an error?

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A few questions to help us narrow down:

  1. Which version of Firefox are you running?
  2. Are you installing an add-on from addons.mozilla.org, from third party or local development versions?

Could you try installing a fresh version, for example Beta or Nightly and try installing add-ons on that? This would help us see if there’s an issue in the current Firefox installation/profile or something else.

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It’s the latest version and I am trying to install from the add on menu as I don’t trust 3rd party versions

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Another debugging step: do you happen to have ESET’s security product installed on your computer? In the summer we saw this particular error popping up for users who had that.

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No I don’t have any ESET security products installed