In Chrome, I can use chrome.runtime.getURL('/mypage.html') as a redirect url because in chrome the extension id is never changed.
In Safari, however, the extension id keeps changing in every (xcode) build. This is similar to the behaviour of Firefox but in Firefox, I can use browser.identity.getRedirectURL(). Although not reachable, it guarantees to stay the same.
As in Safari, there is NO browser.identity and safari-web-extension:// is blocked by Safari, what url can I use as a redirect URL?