I need last link I middle-clicked to open to the right of current tab. If I middle-click links 1,2,3 on page 0, I need tabs to be 0,3,2,1, instead FireFox places 3-rd link after the 2nd and 2nd after the 1st, resulting in 0,1,2,3. I tried changing browser.tabs.insertRelatedAfterCurrent, but it doesn't seem to have any effect. browser.tabs.insertAfterCurrent is "true". The only thing I found is https://addons.mozilla.org/en-US/firefox/addon/open-tabs-next-to-current/, but it interferes with "Clipboard to Tabs" addon and occasionally seems to not work. FireFox behavior is also wildly inconsistent. It depends on whether I switched to these tabs and interacted with them. Some interactions cause it to forget they were "related".