Split-screen/Tab-in-Tab feature (view more than one tab at once)

[KERR]

Currently I'm doing research on a heap of products, and collating into an online spreadsheet. I'm wearing out the Ctrl+Tab keys flicking back and forth, copying/pasting etc!

It would be awesome to "pop-out" a tab and have it "float" on top like what Picture-in-Picture does. I know you can the tab in a new window, resize it, move it etc but it still doesn't stick on-top and has borders that take up space.

I've seen extensions that try to do split screen for tabs but they don't seem to work very well. Thanks!

[Jon]

(Note: similar ideas have been merged into this thread)

[Rinzler]

Screen Splitter

A button located on the toolbar that allows you to split the screen in two and have two tabs on the same screen (similar to the option currently available in Edge). This would let you view two tabs simultaneously, providing greater comfort and productivity.

[Jon]

(Note: similar ideas have been merged into this thread)

[asafko]

Hi folks, 

Split View feature is now available for testing in Nightly to all users with no restrictions and no pref flipping.

How to test: Update to the latest Nightly and see the attached this handy demo for basic Split View interactions. 
Where to report bugs and give feedback: We are actively polishing and testing the feature, so there's a good number of already known bugs on file. Some of the things you may notice almost immediately: 

• We have not yet started persisting Split Views in session restore. Until this ticket lands, when you restart your Nightly, your Split Views will restore as two standalone adjacent tabs. Once it lands, your Split Views will be restored as Split Views. 

How to report issues: Please file a Bugzilla ticket in the Tabbed browser - Split View component if you find a new issue (we would appreciate it if you could peek at the Bugzilla bug list first to ensure this isn’t a duplicate). If you have general feedback, please post it here as usual. 

When: We’re running community testing through January 15th (you're welcome to continue testing and reporting issues after this date), and we plan to make the feature available in the release channel in Firefox 149 (March 2026).

[tilwiti]

💐🎉 @asafko 

[Locolau]

Thank you so much and great for implementing this, I will do some testing!

[yshavit]

This is great!

I have three related pieces of usability feedback:

1. When inactive tabs have the‌✖️‌close button, each split includes its own close. This makes it too easy to accidentally close the left split when I'm trying to click to activate that tab (since the left split's ✖️‌ is in the middle of the tab).
2. It's a bit unitintuive that the ✖️‌ button only closes one of the splits. I think of the ✖️‌ as applying to the tab, not each of its splits. (That said, I can definitely imagine someone else preferring the current behavior. Can't win 'em all! 🙂 )
3. When I do close a split, and then try to undo the close, it opens it as a new tab. I'd like it restored to the split it came from.

The first one of those is the biggest for me — the other two are basically downstream effects that I suffer from regularly because of the first.

But again, this is great. Thank you for it!

[noname]

---

Hi folks, 

Split View feature is now available for testing in Nightly to all users with no restrictions and no pref flipping.

---

Actually, the way you've implemented it seems very odd, considering the browser itself already has the "tile tabs we" extension, which implements the function you implement much better than you're implementing it. So what's the point of testing what you've added if you haven't come close to matching the functionality of the "tile tabs we" extension for your browser? There's nothing to even test, because it works much worse on its own. Moreover, the "tile tabs we" extension allows you to choose whether to arrange tabs horizontally or vertically. In your case, you're only allowed to arrange two tabs, and only vertically. For example, I have one tab selected, and the other has some random chart that's constantly updating. And if I don't keep the second tab active, it seems to go to sleep. What's the point of your feature if the "tile tabs we" extension works much better and doesn't sleep anything? In the extension, no matter how many tabs I have open—5 or 6, that is—all the tabs will be active, they won't sleep, and they won't slow down! (Like you do). I understand that you developers have computers with multi-core processors, and you can't even notice that even two tabs are slow! But please ask those with quad-core processors: since when is it that a quad-core processor isn't enough to display two active tabs? If you haven't even come close to the "tile tabs we" extension in terms of features and performance, and even if you select two vertical tabs in the "tile tabs we" extension, like you do, "tile tabs we" will still work better because it doesn't freeze tabs! But your second tab will be frozen. It will slow down execution, including some scripts. But if the second tab contains text, fine—let the text lag, but the second tab usually contains something other than text, and that will lag! So your function can't even display two tabs at once. And "tile tabs we" is better than what's written in the browser core... a nightmare.

[bric3]

Hi,

First I'm very happy with the feature being shipped in Firefox. Right now I'm testing 149b1.

However I think the feature is not enough discoverable, for example right clicking on a link does not suggest to open in the split tab.

To discover the option one has to right click on the tab. Which is unlikely to be the first thought on the matter.

 

[Ramouz]

@bric3 - Agreed. There definitely needs to be a button too next to the search bar or customizable just like in Edge and Vivaldi.

[asafko]

@bric3 Thank you for your feedback! It took us a bit of time to get to this, but the Open Link in Split View menu item is already live in Nightly, and will be available in Release 149 once it ships. 

[bric3]

Cool thanks ! @asafko 

I found another integration though on the tab menus, sometime you open a link from outside the navigator. But you'd like to make it a split of another tab. So I was thinking about something like

1. Open link A in the browser
2. Open Link B from outside
   1. Now B is the active tab
3. Now right click on tab A, suppose there's this item in the menu : "Add as split view", click it
   1. There's now the tab B, A, where B is on the left, A on the right

Of course the main idea is point 3, the others are just example usage.