Funcions `loadOneTab` and `loadURI` in 2023 in Firefox Experimental API?

I am using the Experimental API in my private Firefox extension.

So far, I've been using Firefox 102 ESR, but I'm planning to switch to Firefox ESR 115. There's already a Firefox 115 Beta available, so I've started testing it with my private extension.

So far, I've been using internal Firefox functions like loadOneTab and loadURI and it worked very well.

I used the loadOneTab function like this:

const placesURL = "chrome://browser/content/places/places.xhtml";
		window.gBrowser.loadOneTab( placesURL, {
			inBackground: false,
			allowThirdPartyFixup : true,
			relatedToCurrent : true,
			triggeringPrincipal : services.scriptSecurityManager.getSystemPrincipal()
		} );

But the loadOneTab function no longer exists at all in Firefox's internal API. What should I replace it with?

I found the function _createTab:

// window.gBrowser._createTab({ uriString: placesURL });

But the _createTab function returns an error:

Uncaught Error: UserInteraction with id "browser.tabs.opening" was not initialized

...I guess this is by security to make this function called only by user action? And I call this function inside async function.

Is it somehow possible to open a new tab from the Experimental API in Firefox 115 beta?
I need this very badly. Really very much.

I used the loadURI function like this:

window.gBrowser.selectedBrowser.loadURI(linkGo, {triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal()});

The loadURI function appears to still be available in Firefox's internal API, but returns an error like this:

TypeError: 'uri' member of CancelContentJSOptions is not an object. RemoteWebNavigation.sys.mjs:28:41

How to overcome this error?