"Viewing multiple pages concurrently" issue repeatedly mentions tabs as something that needs to be designed https://github.com/MozillaReality/FirefoxReality/issues/635, in May saying "Will keep this issue open for designing Tabs. Feel free to make changes to track the design + engineering."
But then in June it's "Closing this in favor of new meta bug #1319"
And #1319 does not mention tabs anywhere. https://github.com/MozillaReality/FirefoxReality/issues/1319
Maybe tabs have been implicitly bundled into "multiwindow" when they're talking about that? Can't check myself because the Quest version doesn't have any multiwindow support, it looks like they're working on a crash issue for it.
I tried a dev build sideloaded last week on the Quest and being in a single-window no-tab environment where you can only have one page open at a time is very limiting. But as soon as that's worked out, I'll be switching to this as the main browser.
I wonder if it will be possible for someone to patch Oculus Home so that the Browser button opens this instead.