diff --git a/site/source/misc-guides/tor-ff.rst b/site/source/misc-guides/tor-ff.rst
index cd40c6c..7af2073 100644
--- a/site/source/misc-guides/tor-ff.rst
+++ b/site/source/misc-guides/tor-ff.rst
@@ -94,6 +94,8 @@ Configuring Firefox for Tor
 
     .. group-tab:: Linux
 
+        .. caution:: If you cannot connect after following this guide, your Firefox may be installed in a jailed environment, such as an AppImage, Flatpak, or SNAP.  Please try an alternate install method that does not isolate Firefox from the regular filesystem.
+
         #. Ensure you are already :ref:`running Tor on your Linux machine <tor-linux>`.
 
         #. Download the `Proxy Auto Config` file to inform Firefox how to resolve `.onion` URLs. You can get Start9's standard file from a terminal, by using: