Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

FF does not allow mega ad-on to install? why?

  • 1 reply
  • 8 have this problem
  • 3 views
  • Last reply by cor-el

more options

Mega.nz has an add-on that is verified and firefox does not want to install it because it is not verified!

What to do to get that Mega add-on?

Mega.nz has an add-on that is verified and firefox does not want to install it because it is not verified! What to do to get that Mega add-on?

Chosen solution

You can set the xpinstall.signatures.required pref to false on the about:config page to allow installing unsigned extensions in Firefox 41.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

Firefox 42 won't allow this any more.


Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

You can set the xpinstall.signatures.required pref to false on the about:config page to allow installing unsigned extensions in Firefox 41.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

Firefox 42 won't allow this any more.