Do not confuse Firefox's native All Tabs menu with the All Tabs Preview feature that Mozilla removed from the browser in Firefox 21. The All Tabs menu displays a list of all open tabs when clicked on. You can use it to switch to any open tab in the browser but that is about it.
It should be displayed on the right side of your browser's tabbar. If it is not, do the following to display it. Press the Alt-key on your keyboard and select View > Toolbars > Customize from the context menu. An overlay window becomes visible on the screen displaying various icons that you can add to Firefox.
Locate the List all tabs icon and drag & drop it to a visible toolbar in the browser. You can click on it from that moment on to display all open tabs of that browser window.
All Tabs Helper is a browser extension for Firefox that improves the All Tab menu of the browser.
Instead of just displaying a list of open tabs, it makes available the following visible options:
Tip: To select multiple tabs hold down Ctrl-Shift to do so.
That's however not all of the add-on's functionality. It also makes available features that are not visible right away:
All Tabs Helper displays unloaded tabs in a lighter gray so that you can distinguish them easily from active tabs.
The extension is mostly useful to Firefox users who make use of the browser's native implementation anyway, and users who work with dozens of tabs open at the same time as it may improve their handling of tabs in Firefox.
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