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This seems to work well if there is a Firefox 57 compatable Extension. Can use google search terms : Firefox Extension <old extension name> Comparable

Please let us know if this solved your issue or if need further assistance.

Please check out this new extension:

Open Tabs Next to Current by Sebastian Blask https://addons.mozilla.org/firefox/addon/open-tabs-next-to-current/

Does that have the features you need?

Open Tabs Next To Current gets me much closer. Just installed it and will play around with it.

Thanks for your help.

If more suggestions are needed try these add-ons: https://addons.mozilla.org/en-US/firefox/collections/mozilla/tab-organizers/

Hey, I am also an avid fan of Tab Mix Plus. However, now with FF 57, I had to let go. The best replacement I found was TreeStyle Tabs. It takes a bit of getting used to, but once you do, it is amazing ! Now I feel that TabMixPlus was a solution to the simptom, not the problem. It made managing tabs easier by putting some logic into horizontal tabs. However, for power users, vertical tab bar with indentation is the real solution, as it represents EXACTLY the way we use the web.

In TMP, one enabled tabs to be opened next to the current one because they were related to it. With TST, tabs related to this one are indented under it, in it's own tree (group). And New tab (ctrl + T) from current tab goes right next to it, as it is a sibling.

I highly encourage you to give a try to TreeStyle Tabs. When doing so, try to disable the top bar, to get used the tree structure.