Click default "Browse" tab of ribbon on New/Edit forms to reset the ribbon instead of Edit tab - SharePoint

Write the following code in your window.onload() :- 

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function ResetRibbon() {

            try {

                var ribbon = SP.Ribbon.PageManager.get_instance().get_ribbon();

                SelectRibbonTab("Ribbon.Read", true);

                ribbon.removeChild("Ribbon.ListForm.Display");

                ribbon.removeChild("Ribbon.ListForm.Edit");

            } catch (e)

            { }

        }

        SP.SOD.executeOrDelayUntilScriptLoaded(function () {

            try {

                var pm = SP.Ribbon.PageManager.get_instance();

                pm.add_ribbonInited(function () {

                    ResetRibbon();

                });

                var ribbon = null;

                try {

                    ribbon = pm.get_ribbon();

                }

                catch (e) { }

                if (!ribbon) {

                    if (typeof (_ribbonStartInit) == "function")

                        _ribbonStartInit(_ribbon.initialTabId, false, null);

                }

                else {

                    ResetRibbon();

                }

            } catch (e)

            { }

        }, "sp.ribbon.js");