You can get the browser url as below.
add one for each tab, when tab loads the url will be sent in the payload.
[{"id":"197cb9b.8e143c6","type":"ui_template","z":"b779de97.b1b46","group":"ada4e0c8.ca2d58","name":"","order":0,"width":0,"height":0,"format":"<script>\n(function(scope) {\n scope.send({payload: window.location.href}); \n})(scope);\n</script>","storeOutMessages":false,"fwdInMessages":false,"resendOnRefresh":false,"templateScope":"local","x":450,"y":3520,"wires":[["1adc3f5c.41ec09"]]},{"id":"1adc3f5c.41ec09","type":"debug","z":"b779de97.b1b46","name":"","active":true,"console":"false","complete":"false","x":719,"y":3520,"wires":[]},{"id":"ada4e0c8.ca2d58","type":"ui_group","z":"b779de97.b1b46","name":"Default","tab":"e4c8df5a.bc9048","order":1,"disp":true,"width":"6"},{"id":"e4c8df5a.bc9048","type":"ui_tab","z":"b779de97.b1b46","name":"tab2","icon":"dashboard"}]
<script>
(function(scope) {
scope.send({payload: window.location.href});
})(scope);
</script>
[edit]
you can also get the port , hostname and more if required