I was a long-term holdout on 3.6.x and finally made the jump. I've found enough add-ons & plug-ins to make 11 look as close to 3.6.x as reasonably possible, but with one singular (and grating) exception:
Does anyone know how to recreate the Tab Mix Plus behavior where I could get a New Tab button on the far left side of the Tab Bar? Yes, I know I can double-click or middle-click, but I want my New Tab button in the exact same spot it's been for years.
Nous sommes tous Charlie.