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Multiple Tab Handler is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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This extension gives you the ability to perform actions that affect multiple tabs.

To select the tabs, just left-click on a tab and drag your mouse over the other tabs that you’d like to select. The tabs will change color to indicate that they’ve been selected.

Once you release your mouse button, you’ll be presented with a menu:

 

 

In the above example, all 3 tabs have been selected. Whatever is chosen from the menu will affect all 3 tabs.

There are few things that caught my attention:

First, what if you don’t want to select tabs that are adjacent to one another?

Second, this extension overrides the default funtion of rearranging the order of tabs when left-clicking and dragging them. What if you don’t like that?

Fortunately, in the options window, you can take care of both issues:

 

 

Under “Action for dragging of tabs” choose “Default.” This reinstates the function of rearranging your tabs when left-clicking and dragging them.

Under “Action for Ctrl(Command)-Click of tabs” choose “Toggle Selection of Tab.” Now to select multiple tabs, just hold down the Ctrl key on your keyboard and left-click on the tabs that you’d like to select. You’ll notice in the screenshot below that the 2 tabs that were chosen are not adjacent to one another:

 

 

Here are the rest of the customizations available in the options window: