Salutations! I'm looking for a solution to install an add-on for all users. Specifically, we're using the Symantec PKI client (https://knowledge.verisign.com/support/mpki-support/index?page=content&id=SO27063&actp=search&viewlocale=en_US). The current version, as seen in the support page, has to be installed manually. the problem is, every time new user logs into the system with the latest version of the PKI client installed, this webpage will pop up, annoying users. As a workaround to this issue, I'm looking to install the add-on linked in on the support page and have it enabled for all users by default. I followed this article's chosen solution, but it does not appear to have installed the add-on: https://support.mozilla.org/en-US/questions/966922 Any assistance would be appreciated! The version of firefox that I attempted the solution in was version 35.0.1, but most of our systems are running in the ESR channel, version 31.4.0. Cheers, Moose P.S. I've added the troubleshooting information, but my workstation is fairly unique, so I'm not sure if it'll be very applicable to most of the systems in our environment.