diff --git a/httpstatic/chan_monitors.js b/httpstatic/chan_monitors.js
index 9c4b06db..d5d3d5b3 100644
--- a/httpstatic/chan_monitors.js
+++ b/httpstatic/chan_monitors.js
@@ -1,5 +1,5 @@
 import choc, {set_content, DOM, on} from "https://rosuav.github.io/choc/factory.js";
-const {A, BR, BUTTON, CODE, DIV, FIELDSET, INPUT, LABEL, LEGEND, OPTGROUP, OPTION, SELECT, SPAN, TABLE, TD, TEXTAREA, TH, TR} = choc; //autoimport
+const {A, BR, BUTTON, CODE, DIV, FIELDSET, INPUT, LABEL, LEGEND, OPTGROUP, OPTION, P, SELECT, SPAN, TABLE, TD, TEXTAREA, TH, TR} = choc; //autoimport
 import {update_display, formatters} from "$$static||monitor.js$$";
 import {simpleconfirm, TEXTFORMATTING} from "$$static||utils.js$$";
 
@@ -99,6 +99,18 @@ set_content("#editcountdown form div", [
 		{name: "textcompleted", label: "Completed", desc: " If blank, same as Active"},
 		{name: "textinactive", label: "Inactive", desc: " If blank, same as Active"},
 	]}),
+	TABLE({border: 1}, [
+		TR(TH({colspan: 2}, "Automate timer based on...")),
+		TR([TH("Scene"), TD([
+			LABEL([INPUT({name: "startonscene", type: "checkbox"}),
+				" Start the countdown when this scene is selected"]),
+			P(["If this countdown is in an OBS scene and it becomes visible, the timer", BR(),
+			"will be started or reset. Good for break/BRB scenes."]),
+			LABEL(["Initial time ", INPUT({name: "startonscene_time", type: "number"}),
+				" Will count down from this time (eg 600 = ten minutes)"]),
+		])]),
+		TR([TH("Schedule"), TD("TODO: Link this timer to your Twitch schedule (maybe w/ offset)")]),
+	]),
 ]);
 
 set_content("#editgoalbar form div", TABLE({border: 1}, [
diff --git a/httpstatic/monitor.js b/httpstatic/monitor.js
index ac9333f1..ba720465 100644
--- a/httpstatic/monitor.js
+++ b/httpstatic/monitor.js
@@ -50,6 +50,15 @@ function countdown_ticker(elem, id) {
 	set_content(elem, parts.join(":"));
 }
 
+let lastvis = "hidden";
+function vischange() {
+	if (lastvis === "hidden" && document.visibilityState === "visible") {
+		//We've just become visible. Signal the server to start the timer.
+		ws_sync.send({cmd: "sceneactive"});
+	}
+	lastvis = document.visibilityState;
+}
+
 export function render(data) {update_display(DOM("#display"), data.data);}
 export function update_display(elem, data) { //Used for the preview as well as the live display
 	//Update styles. The server provides a single "text_css" attribute covering most of the easy
@@ -104,6 +113,9 @@ export function update_display(elem, data) { //Used for the preview as well as t
 		elem._stillebot_countdown_format = m[2];
 		elem._stillebot_countdown_interval = setInterval(countdown_ticker, 1000, elem, data.id);
 		countdown_ticker(elem, data.id);
+		if (data.startonscene && ws_group[0] !== '#') //Don't do this on the control/preview connection
+			(document.onvisibilitychange = vischange)();
+		else document.onvisibilitychange = null; //Note: Using this instead of on() for idempotency
 	}
 	else set_content(elem, data.display);
 }
diff --git a/modules/http/chan_monitors.pike b/modules/http/chan_monitors.pike
index e2a8b7cd..9d1b9956 100644
--- a/modules/http/chan_monitors.pike
+++ b/modules/http/chan_monitors.pike
@@ -3,8 +3,6 @@ inherit hook;
 inherit builtin_command;
 
 /* Subset of functionality from mustard-mine.herokuapp.com:
-* It can be autostarted on page activation - good for a break timer.
-  - On WS connection, if timer not active, start with a known countdown
 * It can be linked to your Twitch schedule (see get_stream_schedule()) to define the target.
   - Note that this will likely mean that schedule updates become crucial.
     - Obviously will require a call to get_stream_schedule inside get_chan_state
@@ -44,7 +42,7 @@ constant vars_provided = ([
 //Some of these attributes make sense only with certain types (eg needlesize is only for goal bars).
 constant saveable_attributes = "previewbg barcolor fillcolor needlesize thresholds progressive lvlupcmd format width height "
 	"active bit sub_t1 sub_t2 sub_t3 exclude_gifts tip follow kofi_dono kofi_member kofi_renew kofi_shop "
-	"fw_dono fw_member fw_shop fw_gift textcompleted textinactive" / " " + TEXTFORMATTING_ATTRS;
+	"fw_dono fw_member fw_shop fw_gift textcompleted textinactive startonscene startonscene_time" / " " + TEXTFORMATTING_ATTRS;
 constant valid_types = (<"text", "goalbar", "countdown">);
 
 __async__ mapping(string:mixed) http_request(Protocols.HTTP.Server.Request req) {
@@ -128,6 +126,7 @@ mapping _get_monitor(object channel, mapping monitors, string id) {
 		"text_css": textformatting_css(text),
 	]);
 }
+
 bool need_mod(string grp) {return grp == "";} //Require mod status for the master socket
 mapping get_chan_state(object channel, string grp, string|void id) {
 	mapping monitors = G->G->DB->load_cached_config(channel->userid, "monitors");
@@ -172,6 +171,15 @@ void websocket_cmd_setvar(mapping(string:mixed) conn, mapping(string:mixed) msg)
 	channel->set_variable(msg->varname, (string)(int)msg->val, "set");
 }
 
+//NOTE: This is a very rare message - a mutator that does not require mod powers or even a login.
+//The *only* thing you can do with it is (re)start a countdown configured to start on scene.
+void wscmd_sceneactive(object channel, mapping(string:mixed) conn, mapping(string:mixed) msg) {
+	mapping mon = G->G->DB->load_cached_config(channel->userid, "monitors")[conn->subgroup];
+	if (!mon->?startonscene) return;
+	sscanf(mon->text, "$%s$:", string varname);
+	channel->set_variable(varname, (string)(time() + (int)mon->startonscene_time));
+}
+
 @hook_allmsgs:
 int message(object channel, mapping person, string msg)
 {