Addon Firefox for closing tabs to the right or left of the current one?

You are — lazy.
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Scored https://addons.mozilla.org/ru/firefox/search/?q=close+tab+right+or+left, ran his eyes and saw https://addons.mozilla.org/ru/firefox/addon/1849/ + a bunch of other extensions. Is it so difficult to look for?

Very good extension, extremely simplifies many common tasks when working with the tabs is "Tab Mix Plus". Points left and right closure tabs appear if you put the checkbox in the settings context menu of the tab (in the screenshot below they are visible in the right column):
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After that the relevant paragraphs appear in the context menu, you can select them and smeknut michou:
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the extension FireGestures to control the gestures are there in settings there are points Close Left Tabs and Right respectively

Better tell me what the practical meaning of this?
If it is about closing tabs to the side results in the analysis of many sites, it is better to "tree style tab" as the universal solution to work with a large number of logically related tabs.