I don't like the SNAP version of Firefox as it is not as quick as the PPA from Mozilla Team. I just installed Firefox via PPA on a new install of 24.04.2, and I'm greeted with the following warning and can't figure out how to resolve it. https://support.mozilla.org/en-US/kb/linux-security-warning
You may see a warning that "some of Firefox’s security features may offer less protection on your current operating system" when you install Firefox on Linux.
I also installed Tor Browser via Flatpak and I'm greeted with the same warning message.
