From a8769e375bc3cb5a638e1b9cf13c50494cb1d4c5 Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Sun, 25 Feb 2018 16:51:07 +0300
Subject: [PATCH] browser.runtime.getBrowserInfo was added in FF 51

---
 js/messaging.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/js/messaging.js b/js/messaging.js
index cc4c317f..7c289f5f 100644
--- a/js/messaging.js
+++ b/js/messaging.js
@@ -18,8 +18,9 @@ if (!CHROME && !chrome.browserAction.openPopup) {
   // in FF pre-57 legacy addons can override useragent so we assume the worst
   // until we know for sure in the async getBrowserInfo()
   // (browserAction.openPopup was added in 57)
-  FIREFOX = 50;
-  browser.runtime.getBrowserInfo().then(info => {
+  FIREFOX = browser.runtime.getBrowserInfo ? 51 : 50;
+  // getBrowserInfo was added in FF 51
+  Promise.resolve(FIREFOX >= 51 ? browser.runtime.getBrowserInfo() : {version: 50}).then(info => {
     FIREFOX = parseFloat(info.version);
     document.documentElement.classList.add('moz-appearance-bug', FIREFOX && FIREFOX < 54);
   });