Brave advertises that “Brave for Android is Brave’s tab-based browser” and even includes pictures of a browser with tabs (attached). Despite this, the browser actually collects windows in the background that are not visible while in the browser.

I am looking for this feature for Firefox Desktop on Windows/Linux, not for Android.

Try to press Ctrl + Tab (with the Ctrl+Tab cycles through tabs in recently used order checkmarked in Options.)

In addition to what others have said, I would recommend the Panorama Tab Groups add-on, which not allows you to view thumbnails of currently opened tabs, but allows you to group them as well.

I used to be part of Firefox, but was removed and replaced with an add-on. The old instructions can be found at the following article: Use Tab Groups to organize a lot of tabs

Thank you very much for your answer. This was exactly what I was looking for.