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For Firefox extensions I am getting the message "xxx could not be verified for use in Firefox" for multiple extensions on two computers

nygiantfan77
nygiantfan77
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For Firefox extensions I am getting the message "xxx could not be verified for use in Firefox", where xxx is the name of the program extension. I am receiving this on multiple computers. (Dashlane, McAfee WebAdvisor, and Protect My Choices). I am receiving this on multiple computers. This seems to have started sometime yesterday.

Is this a problem with the extensions or is it Firefox. Since it is on multiple computers, I don't think it is a problem with my system and believe it is something with Firefox since it is happening with multiple extensions. Thank you.

For Firefox extensions I am getting the message "xxx could not be verified for use in Firefox", where xxx is the name of the program extension. I am receiving this on multiple computers. (Dashlane, McAfee WebAdvisor, and Protect My Choices). I am receiving this on multiple computers. This seems to have started sometime yesterday. Is this a problem with the extensions or is it Firefox. Since it is on multiple computers, I don't think it is a problem with my system and believe it is something with Firefox since it is happening with multiple extensions. Thank you.

All Replies (1)

the-edmeister
the-edmeister
  • Moderator
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All extensions for Firefox need to be signed. During installation of extensions Firefox "verifies" if an extension is signed; if not you get a message. Come Firefox 41 on Sept 22 not signed extensions won't install, but with Firefox 40 not-signed extensions are allowed to be installed and will be enabled. They will have a warning in the Add-ons Manager "... could not be verified for use in Firefox. Proceed with caution."

Dashlane & McAfee WebAdvisor have been mentioned frequently as not being compatible with Firefox 40 for reasons other than "verification". Might be due to a deprecated API that was removed from Firefox 40; add-on developers of record with Mozilla were notified 9 months ago about that API removal, so they weren't caught by a surprise move. Dashlane & McAfee WebAdvisor need to be updated by their respective developers. Protect My Choices - never heard of before.