Use Tor Browser user agent for fetch tests (#19004)

* Use Tor Browser user agent for fetch tests

* Use the latest ESR which TBB is based on

Author: zoracon

test/rules/checker.config.sample

@@ -34,7 +34,9 @@ connect_timeout = 10
 read_timeout = 15
 redirect_depth = 10
 threads = 10
-#user_agent = Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1
+# user_agent should be that of the latest ESR version on which TBB is based on.
+# https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead
+#user_agent = Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
 #curl_verbose = true
 #ssl_version = TLSv1
 fetch_in_subprocess = true

test/rules/coverage.checker.config

@@ -15,7 +15,9 @@ skipfield = 1
 basedir = test/rules/platform_certs
 
 [http]
-user_agent = Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
+# user_agent should be that of the latest ESR version on which TBB is based on.
+# https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead
+user_agent = Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
 # Don't bother doing HTTP, we are just checking coverage and want it to be fast.
 enabled = false
 connect_timeout = 20

test/rules/http.checker.config

@@ -16,7 +16,9 @@ skipfield = 2
 basedir = test/rules/platform_certs
 
 [http]
-user_agent = Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
+# user_agent should be that of the latest ESR version on which TBB is based on.
+# https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead
+user_agent = Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
 enabled = true
 connect_timeout = 20
 read_timeout = 30

test/rules/manual.checker.config

@@ -13,7 +13,9 @@ check_target_validity = true
 basedir = test/rules/platform_certs
 
 [http]
-user_agent = Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
+# user_agent should be that of the latest ESR version on which TBB is based on.
+# https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead
+user_agent = Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0
 enabled = true
 connect_timeout = 20
 read_timeout = 30