I assume it must be for a very old version of Mozilla. Right now (September, 2025) it just duplicate the tabs.

It will delete all your workspace if closed.

When I use 2 windows it deletes everithing!

Great idea, bad implementation.
The workspaces just save the URL for each tab, not the tab itself. This results in having to reload all pages when switching workspaces which can be quite annoying.
Further, workspaces get mixed up. When switching, tabs won't get closed most of the time which leads to a clustered workspace, rendering this addon useless.

Buggy addons. It opens new workspace tabs with old ones. it was good. hope to be fixed soon

Seems like a great idea but dosen't support multiple windows - so not sutable for me - lost tabs immediatly.
Would be 4 stars but given last update was 6 years ago its not likley to ever be fixed.

I lost a whole workspace (all my tabs) because of this addon !

not work...

First Try = Bad Experience

I tried out this add-on, and it f***ed things up right away. Here's what happened:

Testwise, I put two tabs into a new workspace (which essentially is a separate window). Then I closed these tabs, which closed the workspace window, which closed firefox in general (which I didn't want, nor could I have expected, neither did I initiate this).

Fun fact: I had ~50+ tabs open, all of which were gone now. After reopening Firefox, I was presented with an empty browser - no tabs at all. In the browser menue, there were no windows offered for reopening, but at least, I could restore some of the previous tabs. Half of them. Which means that the other, older half is completely and entirely gone through testing out this add-on.

Thanks for that!

I really can't recommend the "tab workspaces" add-on for firefox.

Tried this as a replacement for Opera workspaces. First it worked okay but now it is mixing up the workspaces.
When I switch from one to another it simply adds the tabs of the workspace I want to switch to into the workspace I am currently in, even doing this again when I "switch" again.
Ending in a total mess not usable anymore sadly.. :-/

Used this to organise all my tabs into workspaces. It worked until I re-started Windows. Windows applied an automatic update without my consent. All workspaces disappeared and I lost all tabs except the current one. A spurious empty workspace appeared. Looking through the reviews, I see others have had this problem several years ago. Unfortunately the app gives no advice about the loss of workspaces or where they are saved. There is no consideration of how to back them up. The add-in still ignores the "load when tab is opened" setting in the menu and loads all the tabs in a workspace first, which makes it very slow to open every time. Fortunately I backed up my profiles with all my tabs in. Will be un-installed.
Using W10.0 21H1 and FireFox v97.0.2, both the latest versions at 8 Mar 22.

It's cute but it's not practical.

I like what it does but when you open up a workspace it loads every single tab in the group instead of just the one you're on

It will be nice if it somehow it saved workspaces in a JSON file somewhere on the PC. Just some how.

edit: okay, this is starting to happen much more often now: every so often all tabs except from the group I am currently using will disappear. Without additional tab consistency, I cannot use this addon.

Love the ability to separate tabs by projects and such.

Please add a feature to open link in new workspace when right clicking on a

Saved my tabs into a worskspace, lost all of them

a previous review stated exactly the problem that I randomly get:

"Cannot switch between workspaces. When I try doing this, all tabs from another workspace load in the active one."

Please tell me if I am doing something incorrectly, this problem renders this fantastic feature unusable...

Upgrade to FF 57.0.1 , all defined Workspaces seem to be lost, how to recover ?

Reverses the tabs order on every workspace switch.
On opening a new window it just forgets everything.

登録したタブが全部一瞬で消えた。
使えない！！！！