[ua-overrides] Add ua-overrides for Gecko esr45. Contributes to JB#42873
[ua-overrides] Add ua-overrides for Gecko esr45. Contributes to JB#42873

sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser