Mozilla resolution guide , leading to the inability to open Twitter in Firefox (error or blank page is displayed). The issue has been occurring since Firefox 81, but only affects some users.
As a workaround to regain access to Twitter, it is recommended to go to the āabout:serviceworkersā page, find the block āOrigin: https://twitter.comā, and unregister it by clicking the āUnregisterā button. The problem is also resolved by disabling support for ServiceWorkers by deactivating the parameter dom.serviceWorkers.enabled in about:config. In some cases, but not all, reloading the page with cache clearing (Ctrl+Shift+R) helps.
Source: opennet.ru
