footnote back and forth navigation

1 files changed, 4 insertions, 0 deletions

diff --git a/client/util/index.js b/client/util/index.js
index d0db0d98..0792e24e 100644
--- a/client/util/index.js
+++ b/client/util/index.js
@@ -5,12 +5,16 @@ export const isiPad = !!(navigator.userAgent.match(/iPad/i))
 export const isAndroid = !!(navigator.userAgent.match(/Android/i))
 export const isMobile = isiPhone || isiPad || isAndroid
 export const isDesktop = !isMobile
+export const isFirefox = typeof InstallTrigger !== 'undefined'
 
 export const toArray = a => Array.prototype.slice.apply(a)
 export const choice = a => a[Math.floor(Math.random() * a.length)]
 
 const htmlClassList = document.body.parentNode.classList
 htmlClassList.add(isDesktop ? 'desktop' : 'mobile')
+if (isFirefox) {
+  htmlClassList.add('firefox')
+}
 
 /* Default image dimensions */