I haven't tried a lot of tab unloader add-ons but from the ones i used this is by far the best, the most options, easier to see what tabs is unloaded, and a style that fits nicely into firefox if that is what you want ;)

great add-on to lighten firefox and speed it up

Tab Unloader working just fine with all previous versions of Firefox up to 118 (on Arch Linux).
Usefull settings and default settings, ie: time to auto-unload; visually shows which tabs are un/loaded; don't unload tab that's playing Audio...
Also works fine with Tree Style Tab.

Before opening Firefox, is there some way to tell Firefox to tell "Tab Unloader" to open all tabs unloaded?

Still works. I actually use this only for the option to load a whole bookmark folder unloaded.
Would be great if there were shortcuts like ALT + Click on a link to open it in the background. Context menu item to open link in background unloaded also lacks a keyboard shortcut.

More useful than Auto Tab Discard for me, because Tab Unloader correctly counts the time before automatic tab unloading from the moment the tab was last active / in the foreground before the user switched to a different tab. Auto Tab Discard, in my testing, counts the time since the tab was first opened or last loaded back from the unloaded state, which is quite inconvenient.

Has some issues with unloaded tabs where either it or Firefox "loses" the URL belonging to the tab so the tab can never be reloaded.

Seems to happen between 1/2 and 3/4 of my unloaded tabs (Honestly the ability to reload a tab happens very infrequently, generally an unloaded tab is gone forever) so makes it a non-functional add-on for me

For me the best extension of its kind. It has all the features I need, but without any bloat. Simple and clear options dialog. An option to "bypass the cache on restore", like the old "Auto Unload Tab" extension (pre-Quantum), would be really nice. At the moment I use the extension "Update Discarded Tab On Select" for this.

There are options to "unload this tab" "unload other tabs" etc, but no reload, so I have no idea how to get back the tabs. The UI is not handy at all. I will use another addon of the same kind with a better UI,, like a tabs list for instance, or even a categorization or tagging of several tabs lists.

Doesn't automatically reload tabs.

Some of my Bookmarks now have the discarded favicon permanently. I tried to remove, and re-add the Bookmarks, but it continues to display the faded favicons with the dot. That's annoying and needs to be fixed

He estado haciendo pruebas y ahora mismo funciona mejor que UnloadTabs, además tiene más opciones y un botón para no tener que dar clic derecho sobre las pestañas cada vez que quieras descargarlas.

This is the only one that work perfectly as a tab hibernator on new Firefox

The Good:
- seems to be doing its job
(though FF always still manages to use many 100's of MB and multiple instances of FF
for - I think - installed add-ons, Gmail and YT etc...but prob. Mozilla's fault)
- good extra features,
like only whitelist a particular tab or its whole domain name

The Bad:
- Youtube tabs that are reloaded,
are loading the mobile ("m.youtube[...]") version.
Really annoying!

The Ugly:
- nothing important really.
Maybe the icon. On/off button prob. not the best choice.

This was the lifesaver for my laptop with only 2GB ram. I switched to "Auto Tab Discard" because it has an "... only if number of inactive tabs exceeds [ ]" option. Tab Unlader has the better ui and the better icon though, so I hope competion will bring further improvements. More memory-awareness would be nice, i.e. discard tabs if FF memory consumption exceeds [ ].