diff --git a/doc/configuration.txt b/doc/configuration.txt
index 174be6c..d28de2f 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -979,6 +979,7 @@
    - insecure-fork-wanted
    - insecure-setuid-wanted
    - issuers-chain-path
+   - h2-workaround-bogus-websocket-clients
    - localpeer
    - log
    - log-tag
@@ -1412,6 +1413,15 @@
   "issuers-chain-path" directory. All other certificates with the same issuer
   will share the chain in memory.
 
+h2-workaround-bogus-websocket-clients
+  This disables the announcement of the support for h2 websockets to clients.
+  This can be use to overcome clients which have issues when implementing the
+  relatively fresh RFC8441, such as Firefox 88. To allow clients to
+  automatically downgrade to http/1.1 for the websocket tunnel, specify h2
+  support on the bind line using "alpn" without an explicit "proto" keyword. If
+  this statement was previously activated, this can be disabled by prefixing
+  the keyword with "no'.
+
 localpeer <name>
   Sets the local instance's peer name. It will be ignored if the "-L"
   command line argument is specified or if used after "peers" section
diff --git a/include/haproxy/global-t.h b/include/haproxy/global-t.h
index 1bdbc1b..633bbb5 100644
--- a/include/haproxy/global-t.h
+++ b/include/haproxy/global-t.h
@@ -69,6 +69,7 @@
 #define GTUNE_FD_ET              (1<<18)
 #define GTUNE_SCHED_LOW_LATENCY  (1<<19)
 #define GTUNE_IDLE_POOL_SHARED   (1<<20)
+#define GTUNE_DISABLE_H2_WEBSOCKET (1<<21)
 
 /* SSL server verify mode */
 enum {
diff --git a/src/cfgparse-global.c b/src/cfgparse-global.c
index b539a97..c2a44d9 100644
--- a/src/cfgparse-global.c
+++ b/src/cfgparse-global.c
@@ -128,6 +128,14 @@
 		else
 			global.tune.options |=  GTUNE_SET_DUMPABLE;
 	}
+	else if (strcmp(args[0], "h2-workaround-bogus-websocket-clients") == 0) { /* "no h2-workaround-bogus-websocket-clients" or "h2-workaround-bogus-websocket-clients" */
+		if (alertif_too_many_args(0, file, linenum, args, &err_code))
+			goto out;
+		if (kwm == KWM_NO)
+			global.tune.options &= ~GTUNE_DISABLE_H2_WEBSOCKET;
+		else
+			global.tune.options |=  GTUNE_DISABLE_H2_WEBSOCKET;
+	}
 	else if (strcmp(args[0], "insecure-fork-wanted") == 0) { /* "no insecure-fork-wanted" or "insecure-fork-wanted" */
 		if (alertif_too_many_args(0, file, linenum, args, &err_code))
 			goto out;
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 9cb6eba..fbc7963 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1610,9 +1610,10 @@
 		chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
 	}
 
-	/* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1
-	 * sent automatically */
-	chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6);
+	/* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1,
+	 * sent automatically unless disabled in the global config */
+	if (!(global.tune.options & GTUNE_DISABLE_H2_WEBSOCKET))
+		chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6);
 
 	if (h2_settings_header_table_size != 4096) {
 		char str[6] = "\x00\x01"; /* header_table_size */