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diff --git a/src/webex/compat.ts b/src/webex/compat.ts
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+/*
+ This file is part of TALER
+ (C) 2017 INRIA
+
+ TALER 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, or (at your option) any later version.
+
+ TALER 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.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+ /**
+ * Compatibility helpers needed for browsers that don't implement
+ * WebExtension APIs consistently.
+ */
+
+ export function isFirefox(): boolean {
+ const rt = chrome.runtime as any;
+ if (typeof rt.getBrowserInfo === "function") {
+ return true;
+ }
+ return false;
+ }