Fix firefox .onion error

Troubleshooting.md

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+**Firefox Release  45.0 March 8, 2016:**
+
+Introduce a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level.
+
+The new "feature" is _enabled_ by default to block .onion addresses.
+
+**Browser Error:**
+
+"Server not found" "Firefox can’t find the server at abcxyz.onion" and "problems loading page"
+
+**The Fix:**
+
+`about:config`
+
+Search blockDotOnion
+
+**Change from:**
+
+`network.dns.blockDotOnion user  bolean  true`
+
+**Change to:**
+
+`network.dns.blockDotOnion user  boolean false`