Hello, I been using an add-on for a long while and just redid my computer from scratch and found it that the add-on I use not able to use from the download anymore and they are still developing it but it very slow. I can use a version of it but have to install it manually, the issue is that the system won't install due to it saying, "Firefox has prevented unverified add-on from installing." So how can I install it on my main version and well it is my choice and allow it on and know the issues that come with it.