diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 3566aff1..f7161235 100755
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -888,7 +888,7 @@ def add_upload(ap):
     ap2.add_argument("--df", metavar="GiB", type=float, default=0, help="ensure \033[33mGiB\033[0m free disk space by rejecting upload requests")
     ap2.add_argument("--sparse", metavar="MiB", type=int, default=4, help="windows-only: minimum size of incoming uploads through up2k before they are made into sparse files")
     ap2.add_argument("--turbo", metavar="LVL", type=int, default=0, help="configure turbo-mode in up2k client; [\033[32m-1\033[0m] = forbidden/always-off, [\033[32m0\033[0m] = default-off and warn if enabled, [\033[32m1\033[0m] = default-off, [\033[32m2\033[0m] = on, [\033[32m3\033[0m] = on and disable datecheck")
-    ap2.add_argument("--u2j", metavar="JOBS", type=int, default=2, help="web-client: number of file chunks to upload in parallel; 1 or 2 is good for low-latency (same-country) connections, 4-8 for android clients, 16-32 for cross-atlantic (max=64)")
+    ap2.add_argument("--u2j", metavar="JOBS", type=int, default=2, help="web-client: number of file chunks to upload in parallel; 1 or 2 is good for low-latency (same-country) connections, 4-8 for android clients, 16 for cross-atlantic (max=64)")
     ap2.add_argument("--u2sort", metavar="TXT", type=u, default="s", help="upload order; [\033[32ms\033[0m]=smallest-first, [\033[32mn\033[0m]=alphabetical, [\033[32mfs\033[0m]=force-s, [\033[32mfn\033[0m]=force-n -- alphabetical is a bit slower on fiber/LAN but makes it easier to eyeball if everything went fine")
     ap2.add_argument("--write-uplog", action="store_true", help="write POST reports to textfiles in working-directory")
 
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 9301f1c0..98c14d0c 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -465,6 +465,7 @@ var Ls = {
 		"u_emtleakf": 'try the following:\n<ul><li>hit <code>F5</code> to refresh the page</li><li>then enable <code>🥔</code> (potato) in the upload UI<li>and try that upload again</li></ul>\nPS: firefox <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1790500">will hopefully have a bugfix</a> at some point',
 		"u_s404": "not found on server",
 		"u_expl": "explain",
+		"u_maxconn": "most browsers limit this to 6, but firefox lets you raise it with <code>connections-per-server</code> in <code>about:config</code>",
 		"u_tu": '<p class="warn">WARNING: turbo enabled, <span>&nbsp;client may not detect and resume incomplete uploads; see turbo-button tooltip</span></p>',
 		"u_ts": '<p class="warn">WARNING: turbo enabled, <span>&nbsp;search results can be incorrect; see turbo-button tooltip</span></p>',
 		"u_turbo_c": "turbo is disabled in server config",
@@ -956,6 +957,7 @@ var Ls = {
 		"u_emtleakf": 'prøver følgende:\n<ul><li>trykk F5 for å laste siden på nytt</li><li>så skru på <code>🥔</code> ("enkelt UI") i opplasteren</li><li>og forsøk den samme opplastningen igjen</li></ul>\nPS: Firefox <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1790500">fikser forhåpentligvis feilen</a> en eller annen gang',
 		"u_s404": "ikke funnet på serveren",
 		"u_expl": "forklar",
+		"u_maxconn": "de fleste nettlesere tillater ikke mer enn 6, men firefox lar deg øke grensen med <code>connections-per-server</code> in <code>about:config</code>",
 		"u_tu": '<p class="warn">ADVARSEL: turbo er på, <span>&nbsp;avbrutte opplastninger vil muligens ikke oppdages og gjenopptas; hold musepekeren over turbo-knappen for mer info</span></p>',
 		"u_ts": '<p class="warn">ADVARSEL: turbo er på, <span>&nbsp;søkeresultater kan være feil; hold musepekeren over turbo-knappen for mer info</span></p>',
 		"u_turbo_c": "turbo er deaktivert i serverkonfigurasjonen",
diff --git a/copyparty/web/ui.css b/copyparty/web/ui.css
index 72b36a1d..e27030ec 100644
--- a/copyparty/web/ui.css
+++ b/copyparty/web/ui.css
@@ -147,6 +147,10 @@ html {
 #toast.err #toastc {
 	background: #d06;
 }
+#toast code {
+	padding: 0 .2em;
+	background: rgba(0,0,0,0.2);
+}
 #tth {
 	color: #fff;
 	background: #111;
diff --git a/copyparty/web/up2k.js b/copyparty/web/up2k.js
index 701248f4..5386d5eb 100644
--- a/copyparty/web/up2k.js
+++ b/copyparty/web/up2k.js
@@ -2720,6 +2720,9 @@ function up2k_init(subtle) {
         if (parallel_uploads > 16)
             parallel_uploads = 16;
 
+        if (parallel_uploads > 7)
+            toast.warn(10, L.u_maxconn);
+
         obj.value = parallel_uploads;
         bumpthread({ "target": 1 });
     }