Inside tab groups, the new tab doesn't open right next to the current tab but two tabs to the right.

Works as intended with some problems, especially in newer versions. Be careful since it can crash Firefox if you're using Wayland in Linux.

Still working great on Firefox 133, thank you!

It works, except for the fact that it jumps you to the end all the same. Fixing that would make this perfect. Much better than the default, though.

browser.tabs.insertAfterCurrent didn't work for me, but this works perfectly

Addon developer not willing to continue development due to allegedly no cooperation of Mozilla. Addon superfluous with browser.tabs.insertAfterCurrent being in Firefox now, and Mozilla apparently not appreciating this addon-developer for his time.

This addon appears to to do what it claims to do, open a new tab next to the active one. However, when a new tab is opened from bookmarks, the tab bar scrolls all the way to the right, defeating the purpose of the addon for my use if the active tab is near the left. This behavior may be caused by Firefox, but the addon does not deal with it. I miss FF52, when all things were possible.

browser.tabs.insertAfterCurrent does NOT work as I expected. If I middle-click to open, say, 3 links from a page, the tab order will look like this "(current) (1) (2) (3)". browser.tabs.insertAfterCurrent works only when using Ctrl+T or clicking the "New Tab" button.

But this extension works perfectly! If I middle-click to open 3 tabs after installing this extension, the final tab order looks like this: "(current) (3) (2) (1)" i.e. the last opened tab is closest to the current tab.