Hello, I searched the same problem as mine but I have not found ... Let me explain: I am testing with SSL filtering and I have a problem when trying to install some addons. For example here: https://addons.mozilla.org/fr/firefox/addon/master-password/?src=ss ... The addon starts downloading but then an error message appears: "Master password + could not be installed because it is not compatible with Firefox 9.0.1" ... Which is completely false because I even tried to install the addon without the filtering of SSL Eset and it installs correctly. Do you have a solution or is it something you are working? Thank you.