There still are funny Japanese translate "タブ島" in Right click menu. These menu are "Make tab-islands" and "Take this tab out from tab-islands".

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And in the menu closeing all tabs in tab-islands, too. I think it is good to translate this menu "アイランドを閉じる".

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@juan2006raptorm

Take a look at this page from Google itself.
https://support.google.com/translate/answer/6142468?ref_topic=7011659&hl=en

It said "This feature is only available on Chrome."
I bet they reserved this features for chrome user so there might be more reason for user to move to chrome.