Hello. I used FF with Tab Mix Plus addon for years, but now WebExtension limited most features. One feature I very liked in Tab Mix Plus was changed tab open and close order. For example: 1. I open google site (on first tab - parent) and mouse click with Ctrl a few links. Several unread tabs open, one by one (e.g. 2 to 5 - childs). 2. I switch to the third tab. I read content. When I close this tab, Firefox should switch me to first tab again (with google site list in this example) - just to the parent tab again. Instead, without TabMix, Firefox switches to the nearest tab on the right, so I must manually switch to first tab. This is very annoying to me. In other words - FF upon close one tab, should switch to last visited tab - not nearest tab on the right. Is there any solution for this? Thanks!