Pontoon: Update English (Great Britain) (en-GB) localization of Firef…

…ox Profiler

Co-authored-by: Ian Neal <[email protected]>

locales/en-GB/app.ftl

@@ -343,6 +343,15 @@ Home--load-files-from-other-tools2 =
     any file using the <dhat>dhat format</dhat> or <traceevent>Google’s Trace Event
     Format</traceevent>. <write>Learn how to write your
     own importer</write>.
+Home--install-chrome-extension = Install the Chrome extension
+Home--chrome-extension-instructions =
+    Use the <a>{ -profiler-brand-name } extension for Chrome</a>
+    to capture performance profiles in Chrome and analyse them in the
+    { -profiler-brand-name }. Install the extension from the Chrome Web Store.
+Home--chrome-extension-recording-instructions =
+    Once installed, use the extension’s
+    toolbar icon or the shortcuts to start and stop profiling. You can also
+    export profiles and load them here for detailed analysis.
 
 ## IdleSearchField
 ## The component that is used for all the search inputs in the application.