Recs.
Updated
Saves up to 95% of memory because it reduces the number of open tabs in Google Chrome and Mozilla Firefox.
Specs
Pros
Pro Overall very useful
It takes all of your tabs (choose between all/all-except-current/current/all-to-right/all-to-left) and turns them into links in a special OneTab tab where you can further manage your tabs by dividing them into groups, removing duplicates and securing them so that they can't be removed unless unsecured.
Pro Gives you the option to use it how you want.
Left Clicking on the Icon for the default action sends all currently open tabs to OneTab and opens the OneTab page, where everything you have sent to it is listed by date. But you can easily choose how you want OneTab to function differently.
If you right click for the menu you can:
Just open the OneTab page.
Just send all open tabs to OneTab
Send all open tabs besides the one you are looking at to OneTab
Send just the tab you're looking at to OneTab and leave everything else alone
And within the OneTab page itself, you can leave it organized by date or you can just drag and drop links to make related lists, which you can then label or relabel whatever you like.
Pro Non-invasive
The OneTab dashboard only appears the first time you open your browser after quitting, although you can also make it appear through the extension button in the extensions bar. This is less invasive behavior than the Chrome extensions that appear every time you open a new browser tab.
Cons
Con Slightly confusing UX
It's easy to forget that clicking on the OneTab button in the extensions bar doesn't show you options – it saves your current session by closing all your tabs in the given browser window. That might be slightly annoying if you were trying to access the OneTab dashboard or view OneTab options instead of trying to save your current session in OneTab, but this is only a minor inconvenience given how easy it is to restore your session.
Con Clicking an item defaults to removing it from the list
If you left click to open, it opens the tab and deletes the reference link entirely.
If you right click, you can open it in a new tab but it still pulls the link out of the list to be dragged and dropped where you want. Which might be convenient if you resort every time. But if you want it to stay where it was, you have to take a second to put it back.