Firefox 43 introduced a change in about:home which makes snippets with text boxes to always lose focus to the main search box. There's a JS level fix that we can apply on the service level to fix all templates with an input box. See bug 1238092 This affects 43 and 44. We need to keep this fix until usage of Fx44 drop significantly.
Commit pushed to master at https://github.com/mozilla/snippets-service https://github.com/mozilla/snippets-service/commit/30de4ae212c00c90dcb1fd17b9c3b7d5783591f7 [bug 1241124] Prevent search box from stealing keypresses.