Is there a way to make custom tab available on all pages of SharePoint Online website? For SharePoint Farm solution you can register a Delegate Control and activate it on a server side like this:

SPRibbon ribbon = SPRibbon.GetCurrent(this.Page);
if (!ribbon.IsTabAvailable("Ribbon.CustomTabExample")) {

But in SharePoint Online we don't have server side code. Is there any other way to activate the tab on SharePoint Online? Maybe there is a way to call MakeTabAvailable from javascript?

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