diff --git a/securedrop/static/js/source.js b/securedrop/static/js/source.js
index a270285896..2af98a6457 100644
--- a/securedrop/static/js/source.js
+++ b/securedrop/static/js/source.js
@@ -1,5 +1,5 @@
-const TBB_UA_REGEX = /Mozilla\/5\.0 \((Windows NT 10\.0|X11; Linux x86_64|Macintosh; Intel Mac OS X 10\.[0-9]{2}|Windows NT 10\.0; Win64; x64|Android; Mobile); rv:[0-9]{2}\.0\) Gecko\/20100101 Firefox\/([0-9]{2})\.0/
-const ORFOX_UA_REGEX = /Mozilla\/5\.0 \(Android; Mobile; rv:[0-9]{2}\.0\) Gecko\/20100101 Firefox\/([0-9]{2})\.0/;
+const TBB_UA_REGEX = /Mozilla\/5\.0 \((Windows NT 10\.0|X11; Linux x86_64|Macintosh; Intel Mac OS X 10\.[0-9]{2}|Windows NT 10\.0; Win64; x64|Android; Mobile); rv:[0-9]{2,3}\.0\) Gecko\/20100101 Firefox\/([0-9]{2,3})\.0/
+const ORFOX_UA_REGEX = /Mozilla\/5\.0 \(Android; Mobile; rv:[0-9]{2,3}\.0\) Gecko\/20100101 Firefox\/([0-9]{2,3})\.0/;
 
 function fadeIn(el, duration = 200, displayStyle = "block") {
   const frameDuration = 16;