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Simple useful add-on for users with many open tabs Rated 4 out of 5 stars
Very handy if you tend to keep a lot of tabs open and occasionally want a new tab next to the current one.
Works fine for my use case (thanks Archaeopteryx), but doesn't seem to work properly if you have changed browser.tabs.insertRelatedAfterCurrent to false (see: https://forums.mozilla.org/addons/viewtopic.php?f=28&t=11616)
Options also allow setting (unmodified) left-click, should you want to change the default behavior (thus it's also a partial replacement for Tab Control add-on, which is no longer maintained).