Useful extension, my main request would be for it to respect tab grouping. When using the "Right of current tab" setting and creating a new tab from the rightmost tab of a tab group with another group to the right of it, the new tab will be added to the other group. The tab should stay in the same group as the tab from which it was created. Unfortunately, it doesn't look this extension is being updated.

Excellent, make almost EVERY TAB (include newtab from urlbar/searchbar and newtab button)be opened in Background.
But it's only valid when its option page opened.

Works good. But there is no option to disable shortcuts for tab reorder.
This shortcuts made me angry after unintentional pressing.

This extension works as advertised, after removing other extensions that affect tab opening/closing behavior. The only issue I've found is that it doesn't save any adjusted settings after restarting a new session, and instead reverts to the browser's defaults.