Pontoon: Update English (Great Britain) (en-GB) localization of Mozilla accounts

Co-authored-by: Ian Neal <iann_bugzilla@blueyonder.co.uk>

locale/en_GB/settings.ftl

@@ -401,8 +401,10 @@ cs-sign-out-button = Sign out
 ## Data collection section
 
 dc-heading = Data Collection and Use
-dc-subheader-2 = Help improve { -product-mozilla-accounts }
+dc-subheader-moz-accounts = { -product-mozilla-accounts }
+dc-subheader-ff-browser = { -brand-firefox } browser
 dc-subheader-content-2 = Allow { -product-mozilla-accounts } to send technical and interaction data to { -brand-mozilla }.
+dc-subheader-ff-content = To review or update your { -brand-firefox } browser technical and interaction data settings, open { -brand-firefox } settings and navigate to Privacy and Security.
 dc-opt-out-success-2 = Opt out successful. { -product-mozilla-accounts } won’t send technical or interaction data to { -brand-mozilla }.
 dc-opt-in-success-2 = Thanks! Sharing this data helps us improve { -product-mozilla-accounts }.
 dc-opt-in-out-error-2 = Sorry, there was a problem changing your data collection preference