Fix Edge and Firefox HTTP headers

The HTTP headers for Edge and Firefox were slightly incorrect.

curl patches from
ee0a67058f
and
351dba44d0

firefox/curl_ff95

@@ -12,11 +12,11 @@ dir=`echo "$0" | sed 's%/[^/]*$%%'`
     -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8' \
     -H 'Accept-Language: en-US,en;q=0.5' \
     -H 'Accept-Encoding: gzip, deflate, br' \
-    -H 'Connection: keep-alive' \
     -H 'Upgrade-Insecure-Requests: 1' \
     -H 'Sec-Fetch-Dest: document' \
     -H 'Sec-Fetch-Mode: navigate' \
     -H 'Sec-Fetch-Site: none' \
     -H 'Sec-Fetch-User: ?1' \
+    -H 'TE: Trailers' \
     --http2 --false-start --compressed \
     $@