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Comment by JoshMnem | Hacker News Reader

One Tab is useful to collect all your tabs in a list instead of leaving them open.

https://addons.mozilla.org/en-US/firefox/addon/onetab/

Also, like someone else mentioned, you can visit this in the address bar:

    about:performance

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Niether worked on Firefox for Android.

One Tab acted maliciously: If you open One Tab, it doesn't show any tabs, so as someone who never used it before, I clicked "bring all tabs to One Tab" think you had to click a button to activate it. Nope, it closed all the tabs instead with absolutely no warning or way to undo it.

That's an extremely bad design.

"Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once."

Not sure what you were expecting. And on the OneTab page that gets generated, there's a link that says "Restore All" right at the top.

That's not applicable to Firefox for Android.

Ah, noted, sorry.

OneTab has been fantastic for killing and restarting Firefox to flush the memory usage without having to reopen the entire session all over again or taking the time to pore through open tabs to pick which to close.

I know about:performance but it isn't as easy to parse as Chrome's Task Manager.

Have you tried it recently? It used to be very hectic, but it isn't anymore (I'm using Beta, not sure if it landed in Stable). It's pretty much identical to Chrome's now.

You can also start it from Menu -> More -> Task Manager. The only thing I'm missing is a handy keyboard shortcut (Shift + Esc works in Chrome/ium).

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