This add-on is Firefox's multiselect feature but with basically every action you can think of. Best of all, you can customize this add-on however you like, from the size and theme of the pop-up panel to which options you would like to be present or hidden from the context menu.

Having major issues with tabs being deselected when attempting to check multiple things. Pretty much made the extension useless.

It doesn't work at all. Most up to date version of firefox, 50% chance it will work when selecting 1 tab, deselects everything after the 2nd tab

Very useful addon. Please, add the option “Go To… (selected Tab)”, function only for one selected Tab. It was very useful, particularly when much tabs are open at the same time and is no so easy to find the one you are searching for.

Now it works fine v2.1.2
but invert selection doesn't work

Es una mierda.

Not good enough for me I'm afraid.

- The window is annoyingly small and can only display a small subset of your tabs. If you're working with 100+, as I frequently do, then it is frustrating not to be able to see the whole list of tabs (or more of it anyway). This is just a clumsy design flaw IMO.

- You can't select multiple batches of tabs. Ideally you should be able to hold down ctrl (as you can in Windows Explorer) to be able to select a batch, then click and drag again to select another batch, while maintaining the selection on the first batch.

- Mostly, I only want to get rid of tabs I don't need anymore. Instead of being a nice big one-click obvious button, the delete option is buried half way down a menu which requires another click to open. (Seriously, why is "Close tabs" not the top option here? The top option is "reload tabs" Seriously? You think more people are selecting multiple tabs with the view to reloading them rather than closing them...?)

This combination of factors makes this addon too cumbersome and frustrating to use. Uninstalling.

While this extension does a lot more currently, you can already test Firefox's implementation by enabling browser,tabs,multiselect in about:config (Firefox 62+, replace commas to periods).

Thanks to the developer for inspiring Mozilla to do this!

Independent of great work on such free plug-in, real problem comes from Firefox, which broke tab context menu, right click on tab.

This forces us to switch to Chrome which support selecting multiple tab by ctrl/shift!

Why do I need this addon if I already have "Tree Style Tab" from the same developer?

The description for this addon lists the menu items that will be added, if used in conjunction with Tree Style Tab, but those menu items already exist in Tree Style Tab without this addon installed.

This is confusing.
Have the features from this addon been merged to the Tree Style Tab addon? Is this addon now abandoned?

This is a confusing mess for users to figure out.

I cannot select tabs... so this extention is useless

Can no longer select multiple tabs at once by Shift/CTRL clicking. This had made the app incredibly intuitive to use and failing to replace it is a huge blow.

Does not work

Раньше работало, теперь нет.

Simple add-on for an obvious need!

Mostly good, but when I move the icon into the top bar, while using the Default theme, it remains black against the dark background instead of switching to white, like so: https://i.imgur.com/rqz12Xd.png