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diff --git a/content/haketilo_apis.js b/content/haketilo_apis.js
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+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Expose some special functionalities to injected scripts using
+ *           CustomEvent's to communicate with them.
+ *
+ * Copyright (C) 2022 Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you
+ * may distribute forms of that code without the copy of the GNU
+ * GPL normally required by section 4, provided you include this
+ * license notice and, in case of non-source distribution, a URL
+ * through which recipients can access the Corresponding Source.
+ * If you modify file(s) with this exception, you may extend this
+ * exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * As a special exception to the GPL, any HTML file which merely
+ * makes function calls to this code, and for that purpose
+ * includes it by reference shall be deemed a separate work for
+ * copyright law purposes. If you modify this code, you may extend
+ * this exception to your version of the code, but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
+ * license. Although I request that you do not make use of this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+#FROM common/browser.js IMPORT browser
+#FROM common/misc.js    IMPORT error_data_jsonifiable
+
+async function on_CORS_bypass(event) {
+    const name = "haketilo_CORS_bypass";
+
+    if (typeof event.detail      !== "object" ||
+	event.detail             === null     ||
+	typeof event.detail.id   !== "string" ||
+	typeof event.detail.data !== "string") {
+	console.error(`Haketilo: Invalid detail for ${name}:`,
+		      event.detail);
+	return;
+    }
+
+    try {
+	const data = JSON.parse(event.detail.data);
+	var result = await browser.runtime.sendMessage(["CORS_bypass", data]);
+	if (result === undefined)
+	    throw new Error("Couldn't communicate with Haketilo background script.");
+    } catch(e) {
+	var result = {error: error_data_jsonifiable(e)};
+    }
+
+    const response_name = `${name}-${event.detail.id}`;
+    const detail = JSON.stringify(result);
+    window.dispatchEvent(new CustomEvent(response_name, {detail}));
+}
+
+function start() {
+    window.addEventListener("haketilo_CORS_bypass", on_CORS_bypass);
+}
+#EXPORT start